What Combat Type is Dr. Ratio?

Dr. Ratio is a 5-star Imaginary character on the Path of The Hunt, from Intelligentsia Guild, released in version 1.6.

What stat does Dr. Ratio scale on?

Dr. Ratio's abilities multiply ATK. That is read from the scaling rows on the Skill and Ultimate, not from the ability description, so it reflects what the game actually multiplies rather than what the text mentions.

What is the best Light Cone for Dr. Ratio?

I Venture Forth to Hunt is the closest fit on the data: it is a 5-star The Hunt Light Cone with 635 base ATK at level 80, and its passive acts on ATK. See You at the End is the best 4-star alternative.

Which relic set should Dr. Ratio use?

Hero of Triumphant Song. Its 2-piece bonus is: Increases ATK by 12%. Its 4-piece bonus is: While the wearer's memosprite is on the field, increases the wearer's SPD by 6%. When the wearer's memosprite attacks, increases the wearer's and memosprite's CRIT DMG by 30%, lasting for 2 turn(s).

Which Planar Ornament should Dr. Ratio use?

Firmament Frontline: Glamoth. Its 2-piece bonus is: Increases the wearer's ATK by 12%. When the wearer's SPD is equal to or higher than 135/160, the wearer deals 12%/18% more DMG. Planar Ornaments have no 4-piece bonus; the sphere and the rope are the whole set.

How much does it cost to max Dr. Ratio's traces?

Taking one ability from level 1 to 10 costs 652,500 Credits and 2× Tracks of Destiny among other materials. The Materials tab lists every item per level.

What does Dr. Ratio E1 do?

Pride Comes Before a Fall: The maximum stackable count for the Trace "Summation" increases by 4. When a battle begins, immediately obtains 4 stacks of Summation. Needs to unlock Summation first.

Dr. Ratio — Imaginary The Hunt character | Honkai: Star Rail

All characters

Intelligentsia Guild

Dr. Ratio

Build guide · Honkai: Star Rail

ImaginaryThe HuntMain DPS

English voice: Jordan Paul Haro

The best Dr. Ratio build in Honkai: Star Rail (Version 4.4) is Baptism of Pure Thought with Pioneer Diver of Dead Waters. Updated August 28, 2026

Where these rankings come fromThe light cone order, relic sets and stat priorities on this tab are prydwen.gg’s, measured in play and rephrased. Relative damage figures are ratios against the bottom of each ranking, not absolute numbers, and each one holds only for the superimposition and team its row states. Everything else — base stats, passive text, material totals — is read from the game’s own data.

Light cones

5 ranked

Baptism of Pure Thought — 5★ The Hunt Light Cone | Honkai: Star Rail

BISBaptism of Pure Thought

116.12% at S1

582

Base ATK · lv 80

953 HP529 DEF

Worrisome, Blissful — 5★ The Hunt Light Cone | Honkai: Star Rail

#2Worrisome, Blissful

107.17% at S1

582

Base ATK · lv 80

1058 HP463 DEF

Only Silence Remains — 4★ The Hunt Light Cone | Honkai: Star Rail

#3Only Silence Remains

101.41% at S5

476

Base ATK · lv 80

953 HP331 DEF

Cruising in the Stellar Sea — 5★ The Hunt Light Cone | Honkai: Star Rail

#4Cruising in the Stellar Sea

100% at S5

529

Base ATK · lv 80

953 HP463 DEF

In the Night — 5★ The Hunt Light Cone | Honkai: Star Rail

#5In the Night

95.75% at S1

582

Base ATK · lv 80

1058 HP463 DEF

Relics

3 sets

CorePioneer Diver of Dead Waters

100% uptime | 3 Debuffs Required

2PCIncreases DMG dealt to enemies with debuffs by 12%.

4PCIncreases CRIT Rate by 4%. The wearer deals 8%/12% increased CRIT DMG to enemies with at least 2/3 debuffs. After the wearer inflicts a debuff on enemy targets, the aforementioned effects increase by 100%, lasting for 1 turn(s).

Also works

Planar ornaments

Sphere and rope · 2-piece only

CoreDuran, Dynasty of Running Wolves

Best planar option for Dr. Ratio due to all of his teams featuring a good amount of Follow-Up attack triggers.

2PCWhen an ally character uses a Follow-Up ATK, the wearer gains 1 stack of "Merit," stacking up to 5 time(s). Each stack of "Merit" increases the DMG dealt by the wearer's Follow-Up ATKs by 5%. When there are 5 stacks, additionally increases the wearer's CRIT DMG by 25%.

Also works

Main stats

Ultimate · 140 energy

Body: CRIT Rate >= CRIT DMG
Feet: Speed > ATK%
Planar Sphere: Imaginary DMG >= ATK%
Link Rope: ATK%

Substat priority

Highest first

1SPD (breakpoint)Best
2CRIT RATE = CRIT DMG
3ATK%

Reaching an acceptable Speed breakpoint for MoC and Pure Fiction while also hitting a high Crit Ratio is your top priority when searching for sub-stats. After achieving these goals ATK% can be searched for as a bonus.

Trace priority

Level in this order

#1
Talent
Max first
#2
Skill
Then
#3
Ultimate
Next
#4
Basic
Later

Major traces, best first: Summation (A2) > Deduction (A6) > Inference (A4)

Best Eidolons

E3 and E5 raise levels only

E1Pride Comes Before a Fall
E2The Divine Is in the Details
E3Level bump
E4Ignorance Is Blight
E5Level bump
E6Vincit Omnia Veritas

E1
Pride Comes Before a Fall
Game text
The maximum stackable count for the Trace "Summation" increases by 4. When a battle begins, immediately obtains 4 stacks of Summation. Needs to unlock Summation first.
E2
The Divine Is in the Details
Game text
When his Talent's Follow-Up ATK hits a target, for every debuff the target has, deals Imaginary Additional DMG equal to 20% of Dr. Ratio's ATK. This effect can be triggered for a maximum of 4 time(s) during each Follow-Up ATK.
E4
Ignorance Is Blight
Game text
When triggering the Talent, additionally regenerates 15 Energy for Dr. Ratio.
E6
Vincit Omnia Veritas
Game text
Additionally increases the trigger count for "Wiseman's Folly" by 1. The DMG dealt by the Talent's Follow-Up ATK increases by 50%.

Teams

1 team

Dr. Ratio team

Imaginary · The HuntLeads

Dr. Ratio follows up when the target carries enough debuffs, so the team is a follow-up partner, a buffer for it, and a sustain that debuffs on the side.

Dr. Ratio — this characterMain DPS
RobinFollow-up buffer
Topaz & NumbyFollow-up partner
AventurineSustain

All teams, with every replacement

Honkai: Star Rail 5★ Imaginary The Hunt Main DPS

Dr. Ratio build summary

Updated August 28, 2026

Baptism of Pure Thought tops the light cone ranking for Dr. Ratio, at 116.12% relative damage at S1, ahead of Worrisome, Blissful, Only Silence Remains and Cruising in the Stellar Sea. That order is prydwen.gg's, measured in play and rephrased here; every row of it sits under Light cones below.

Run Pioneer Diver of Dead Waters on Dr. Ratio, with Wastelander of Banditry Desert and The Ashblazing Grand Duke behind it. The planar ornament is Duran, Dynasty of Running Wolves. Main stats are CRIT Rate >= CRIT DMG body, Speed > ATK% feet, Imaginary DMG >= ATK% sphere, ATK% rope. Roll substats in the order SPD (breakpoint) > CRIT RATE = CRIT DMG > ATK%.

Trace priority is Talent > Skill > Ultimate > Basic. The Ultimate costs 140 energy, which is what an Energy Regeneration Rate target has to clear.

The strongest team is Dr. Ratio, Robin, Topaz & Numby and Aventurine, built around Dr. Ratio — Imaginary · The Hunt.

Role: Main DPS / Support
Best light cone: Baptism of Pure Thought
Alternatives: Worrisome, Blissful, Only Silence Remains, Cruising in the Stellar Sea
Relic set: Pioneer Diver of Dead Waters
Planar ornament: Duran, Dynasty of Running Wolves
Main stats: CRIT Rate >= CRIT DMG body, Speed > ATK% feet, Imaginary DMG >= ATK% sphere, ATK% rope
Substat priority: SPD (breakpoint) > CRIT RATE = CRIT DMG > ATK%
Trace priority: Talent > Skill > Ultimate > Basic
Best team: Dr. Ratio, Robin, Topaz & Numby, Aventurine
Ultimate energy cost: 140 energy
Key ascension material: 15× Conqueror's Will
Last updated: August 28, 2026

Abilities

4 levellable

Basic

Mind is Might

Single Target
+20 energy
30 Toughness

Deals Imaginary DMG equal to 100% of Dr. Ratio's ATK to one designated enemy target.

Ability level

6 is the cap from trace materials; Eidolons add the rest.

Basic ATK DMG: 100%

All 10 levels

Attribute	1	2	3	4	5	6	7	8	9	10
Basic ATK DMG	50%	60%	70%	80%	90%	100%	110%	120%	130%	140%

Skill

Intellectual Midwifery

Single Target
+30 energy
60 Toughness

Deals Imaginary DMG equal to 150% of Dr. Ratio's ATK to one designated enemy target.

Ability level

10 is the cap from trace materials; Eidolons add the rest.

Skill DMG: 150%

All 15 levels

Attribute	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15
Skill DMG	75%	83%	90%	98%	105%	113%	122%	131%	141%	150%	158%	165%	173%	180%	188%

Ultimate

Syllogistic Paradox

Single Target
+5 energy
90 Toughness

Deals Imaginary DMG equal to 240% of Dr. Ratio's ATK to one designated enemy target and applies "Wiseman's Folly." When Dr. Ratio's teammates attack a target afflicted with "Wiseman's Folly," Dr. Ratio launches 1 instance of his Talent's Follow-Up ATK against this target. "Wiseman's Folly" can be triggered for up to 2 times and only affects the most recent target of Dr. Ratio's Ultimate. This trigger count resets after Dr. Ratio's Ultimate is used.

Ability level

10 is the cap from trace materials; Eidolons add the rest.

Ultimate DMG: 240%

All 15 levels

Attribute	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15
Ultimate DMG	144%	154%	163%	173%	182%	192%	204%	216%	228%	240%	250%	259%	269%	278%	288%

Talent

Cogito, Ergo Sum

Single Target
+5 energy
30 Toughness

When using his Skill, Dr. Ratio has a 40% fixed chance of launching a Follow-Up ATK against his target for 1 time, dealing Imaginary DMG equal to 270% of Dr. Ratio's ATK. For each debuff the target enemy has, the fixed chance of launching Follow-Up ATK increases by 20%. If the target enemy is defeated before the Follow-Up ATK triggers, the Follow-Up ATK will be directed at a single random enemy instead.

Ability level

10 is the cap from trace materials; Eidolons add the rest.

Follow-Up DMG: 270%

All 15 levels

Attribute	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15
Follow-Up DMG	135%	149%	162%	176%	189%	203%	219%	236%	253%	270%	284%	297%	311%	324%	338%

Technique and fixed effects

1 fixed

Technique

Mold of Idolatry

Impair

After using Technique, creates a Special Dimension that Taunts nearby enemies, lasting for 10 second(s). After entering battle with enemies in this Special Dimension, there is a 100% base chance to reduce each single enemy target's SPD by 15% for 2 turn(s). Only 1 Dimension Effect created by allies can exist at the same time.

Bonus Abilities

3 unlocked by ascension

A2
Summation
When Dr. Ratio uses his Skill, for every debuff on the target, his CRIT Rate increases by 2.5% and CRIT DMG by 5%. This effect can stack up to 6 time(s).
A4
Inference
When Skill is used to attack an enemy target, there is a 100% base chance to reduce the attacked enemy target's Effect RES by 10% for 2 turn(s).
A6
Deduction
When dealing DMG to a target that has 3 or more debuff(s), for each debuff the target has, the DMG dealt by Dr. Ratio to this target increases by 10%, up to a maximum increase of 50%.

Stat traces

Every node taken

ATK: 28.0%
CRIT Rate: 12.0%
DEF: 12.5%

Totals at full unlock, summed across every node of that stat. Ascension rank gates the nodes as it gates the Bonus Abilities above.

Full bill

Credits, summed from the tables below

Level 80 and every ability maxed

2,265,500

Credits 12 material lines

Ascension to 80

308,000

Credits 4 materials · 6 steps

All 3 abilities maxed

1,957,500

Credits 3× the single-ability bill

Ascension

Level 1 → 80 in 6 steps

Lv 30
Thief's Instinct ×5
4,000Credits
Lv 40
Thief's Instinct ×10
8,000Credits
Lv 50
Suppressing Edict ×3
Usurper's Scheme ×6
16,000Credits
Lv 60
Suppressing Edict ×7
Usurper's Scheme ×9
40,000Credits
Lv 70
Conqueror's Will ×6
Suppressing Edict ×20
80,000Credits
Lv 80
Conqueror's Will ×9
Suppressing Edict ×35
160,000Credits

Total to level 80

308,000 Credits

Conqueror's Will

Suppressing Edict

Usurper's Scheme

Thief's Instinct

Trace materials

Per ability · 3 levellable

→ 2
Thief's Instinct ×3
2,500Credits
→ 3
Arrow of the Beast Hunter ×3
Thief's Instinct ×6
5,000Credits
→ 4
Arrow of the Demon Slayer ×3
Usurper's Scheme ×3
10,000Credits
→ 5
Arrow of the Demon Slayer ×5
Usurper's Scheme ×4
20,000Credits
→ 6
Arrow of the Demon Slayer ×7
Usurper's Scheme ×6
30,000Credits
→ 7
Arrow of the Starchaser ×3
Conqueror's Will ×3
45,000Credits
→ 8
Arrow of the Starchaser ×5
Conqueror's Will ×4
Past Evils of the Borehole Planet Disaster ×1
80,000Credits
→ 9
Tracks of Destiny ×1
Arrow of the Starchaser ×8
Past Evils of the Borehole Planet Disaster ×1
160,000Credits
→ 10
Tracks of Destiny ×1
Arrow of the Starchaser ×14
Past Evils of the Borehole Planet Disaster ×1
300,000Credits

One ability maxed

652,500 Credits

Tracks of Destiny

Arrow of the Starchaser

Conqueror's Will

Past Evils of the Borehole Planet Disaster

Arrow of the Demon Slayer

Usurper's Scheme

Arrow of the Beast Hunter

Thief's Instinct

All 3 abilities maxed

1,957,500 Credits

Tracks of Destiny

Arrow of the Starchaser

Conqueror's Will

Past Evils of the Borehole Planet Disaster

Arrow of the Demon Slayer

Usurper's Scheme

Arrow of the Beast Hunter

Thief's Instinct

Dr. Ratio’s Eidolons

6 unlocks

E1
Pride Comes Before a Fall
The maximum stackable count for the Trace "Summation" increases by 4. When a battle begins, immediately obtains 4 stacks of Summation. Needs to unlock Summation first.
E2
The Divine Is in the Details
When his Talent's Follow-Up ATK hits a target, for every debuff the target has, deals Imaginary Additional DMG equal to 20% of Dr. Ratio's ATK. This effect can be triggered for a maximum of 4 time(s) during each Follow-Up ATK.
E3
Know Thyself
Ultimate Lv. +2, up to a maximum of Lv. 15. Basic ATK Lv. +1, up to a maximum of Lv. 10.
E4
Ignorance Is Blight
When triggering the Talent, additionally regenerates 15 Energy for Dr. Ratio.
E5
Sic Itur Ad Astra
Skill Lv. +2, up to a maximum of Lv. 15. Talent Lv. +2, up to a maximum of Lv. 15.
E6
Vincit Omnia Veritas
Additionally increases the trigger count for "Wiseman's Folly" by 1. The DMG dealt by the Talent's Follow-Up ATK increases by 50%.

Dr. Ratio FAQ

What Combat Type is Dr. Ratio?: Dr. Ratio is a 5-star Imaginary character on the Path of The Hunt, from Intelligentsia Guild, released in version 1.6.
What stat does Dr. Ratio scale on?: Dr. Ratio's abilities multiply ATK. That is read from the scaling rows on the Skill and Ultimate, not from the ability description, so it reflects what the game actually multiplies rather than what the text mentions.
What is the best Light Cone for Dr. Ratio?: I Venture Forth to Hunt is the closest fit on the data: it is a 5-star The Hunt Light Cone with 635 base ATK at level 80, and its passive acts on ATK. See You at the End is the best 4-star alternative.
Which relic set should Dr. Ratio use?: Hero of Triumphant Song. Its 2-piece bonus is: Increases ATK by 12%. Its 4-piece bonus is: While the wearer's memosprite is on the field, increases the wearer's SPD by 6%. When the wearer's memosprite attacks, increases the wearer's and memosprite's CRIT DMG by 30%, lasting for 2 turn(s).
Which Planar Ornament should Dr. Ratio use?: Firmament Frontline: Glamoth. Its 2-piece bonus is: Increases the wearer's ATK by 12%. When the wearer's SPD is equal to or higher than 135/160, the wearer deals 12%/18% more DMG. Planar Ornaments have no 4-piece bonus; the sphere and the rope are the whole set.
How much does it cost to max Dr. Ratio's traces?: Taking one ability from level 1 to 10 costs 652,500 Credits and 2× Tracks of Destiny among other materials. The Materials tab lists every item per level.
What does Dr. Ratio E1 do?: Pride Comes Before a Fall: The maximum stackable count for the Trace "Summation" increases by 4. When a battle begins, immediately obtains 4 stacks of Summation. Needs to unlock Summation first.

Dr. Ratio

Light cones

Relics

Planar ornaments

Main stats

Substat priority

Trace priority

Best Eidolons

Pride Comes Before a Fall

The Divine Is in the Details

Ignorance Is Blight

Vincit Omnia Veritas

Teams

Abilities

Technique and fixed effects

Bonus Abilities

Summation

Inference

Deduction

Stat traces

Full bill

Ascension

Trace materials

Dr. Ratio’s Eidolons

Pride Comes Before a Fall

The Divine Is in the Details

Know Thyself

Ignorance Is Blight

Sic Itur Ad Astra

Vincit Omnia Veritas

Dr. Ratio FAQ