![Dr. Ratio](https://rerollcdn.com/STARRAIL/Characters/Full/3012.png)
Honkai: Star Rail Dr. Ratio Build
![Imaginary](https://rerollcdn.com/STARRAIL/Elements/imaginary.png)
![The Hunt](https://rerollcdn.com/STARRAIL/Paths/the_hunt_sm.png)
![[object Object] HP](https://rerollcdn.com/STARRAIL/Stats/hp.png)
![[object Object] ATK](https://rerollcdn.com/STARRAIL/Stats/atk.png)
![[object Object] DEF](https://rerollcdn.com/STARRAIL/Stats/def.png)
![[object Object] Speed](https://rerollcdn.com/STARRAIL/Stats/spd.png)
![[object Object] Taunt](https://rerollcdn.com/STARRAIL/Stats/taunt.png)
Dr. Ratio Upgrade Materials
![Thief's Instinct](https://rerollcdn.com/STARRAIL/Farming/Thief's Instinct.png)
![Arrow of the Beast Hunter](https://rerollcdn.com/STARRAIL/Farming/Arrow of the Beast Hunter.png)
![Suppressing Edict](https://rerollcdn.com/STARRAIL/Farming/Suppressing Edict.png)
![Past Evils of the Borehole Planet Disaster](https://rerollcdn.com/STARRAIL/Farming/Past Evils of the Borehole Planet Disaster.png)
Dr. Ratio Best Relics
![Wastelander of Banditry Desert](https://rerollcdn.com/STARRAIL/Relics/wastelander_of_banditry_desert.png)
![The Ashblazing Grand Duke](https://rerollcdn.com/STARRAIL/Relics/the_ashblazing_grand_duke.png)
![Wastelander of Banditry Desert](https://rerollcdn.com/STARRAIL/Relics/wastelander_of_banditry_desert.png)
![Musketeer of Wild Wheat](https://rerollcdn.com/STARRAIL/Relics/musketeer_of_wild_wheat.png)
![Wastelander of Banditry Desert](https://rerollcdn.com/STARRAIL/Relics/wastelander_of_banditry_desert.png)
Dr. Ratio Best Ornaments
![Firmament Frontline: Glamoth](https://rerollcdn.com/STARRAIL/Relics/firmament_frontline_glamoth.png)
![Inert Salsotto](https://rerollcdn.com/STARRAIL/Relics/inert_salsotto.png)
Dr. Ratio Best Light Cone
![Baptism of Pure Thought](https://rerollcdn.com/STARRAIL/LightCones/baptism_of_pure_thought_sm.png)
![Worrisome, Blissful](https://rerollcdn.com/STARRAIL/LightCones/worrisome,_blissful_sm.png)
![In the Night](https://rerollcdn.com/STARRAIL/LightCones/in_the_night_sm.png)
![Sleep Like the Dead](https://rerollcdn.com/STARRAIL/LightCones/sleep_like_the_dead_sm.png)
![Swordplay](https://rerollcdn.com/STARRAIL/LightCones/swordplay_sm.png)
Dr. Ratio Best Stats
Dr. Ratio Best Substats
Dr. Ratio Showcase
Dr. Ratio Skills
![Mind is Might](https://rerollcdn.com/STARRAIL/Skill/SkillIcon_3012_Normal.png)
Basic ATK
Mind is Might
Single Target
Deals Imaginary DMG equal to 50% of Dr. Ratio's ATK to a single target enemy.
![Intellectual Midwifery](https://rerollcdn.com/STARRAIL/Skill/SkillIcon_3012_BP.png)
Skill
Intellectual Midwifery
Single Target
Deals Imaginary DMG equal to 75% of Dr. Ratio's ATK to a single target enemy.
![Syllogistic Paradox](https://rerollcdn.com/STARRAIL/Skill/SkillIcon_3012_Ultra_on.png)
Ultimate
Syllogistic Paradox
Single Target
Deals Imaginary DMG equal to 144% of Dr. Ratio's ATK to a single target enemy and applies Wiseman's Folly. When Dr. Ratio's allies attack a target afflicted with Wiseman's Folly, Dr. Ratio launches his Talent's follow-up attack for 1 time 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.
![Cogito, Ergo Sum](https://rerollcdn.com/STARRAIL/Skill/SkillIcon_3012_Passive.png)
Talent
Cogito, Ergo Sum
Single Target
When using his Skill, Dr. Ratio has a 40% fixed chance of launching a follow-up attack against his target for 1 time, dealing Imaginary DMG equal to 135% of Dr. Ratio's ATK. For each debuff the target enemy has, the fixed chance of launching follow-up attack increases by 20%. If the target enemy is defeated before the follow-up attack triggers, the follow-up attack will be directed at a single random enemy instead.
![Mold of Idolatry](https://rerollcdn.com/STARRAIL/Skill/SkillIcon_3012_Maze.png)
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 created by allies can exist at the same time.
Dr. Ratio Eidolon
![Pride Comes Before a Fall](https://rerollcdn.com/STARRAIL/Skill/Eidolon_3012_1.png)
Eidolon 1
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.
![The Divine Is in the Details](https://rerollcdn.com/STARRAIL/Skill/Eidolon_3012_2.png)
Eidolon 2
The Divine Is in the Details
When his Talent's follow-up attack hits a target, for every debuff the target has, additionally 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 attack.
![Know Thyself](https://rerollcdn.com/STARRAIL/Skill/Eidolon_3012_3.png)
Eidolon 3
Know Thyself
Ultimate Lv. +2, up to a maximum of Lv. 15. Basic ATK Lv. +1, up to a maximum of Lv. 10.
![Ignorance Is Blight](https://rerollcdn.com/STARRAIL/Skill/Eidolon_3012_4.png)
Eidolon 4
Ignorance Is Blight
When triggering the Talent, additionally regenerates 15 Energy for Dr. Ratio.
![Sic Itur Ad Astra](https://rerollcdn.com/STARRAIL/Skill/Eidolon_3012_5.png)
Eidolon 5
Sic Itur Ad Astra
Skill Lv. +2, up to a maximum of Lv. 15. Talent Lv. +2, up to a maximum of Lv. 15.
![Vincit Omnia Veritas](https://rerollcdn.com/STARRAIL/Skill/Eidolon_3012_6.png)
Eidolon 6
Vincit Omnia Veritas
Increases the trigger count for Wiseman's Folly by 1. The DMG dealt by the Talent's follow-up attack increases by 50%.
Dr. Ratio Traces
![Summation](https://rerollcdn.com/STARRAIL/Skill/SkillIcon_3012_Rank1.png)
Ascension 2
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).
![Inference](https://rerollcdn.com/STARRAIL/Skill/SkillIcon_3012_Rank2.png)
Ascension 4
Inference
When Skill is used to attack an enemy target, there is a 100% base chance to reduce the attacked target's Effect RES by 10% for 2 turn(s).
![Deduction](https://rerollcdn.com/STARRAIL/Skill/SkillIcon_3012_Ultra.png)
Ascension 6
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%.