Dr. Ratio — Honkai: Star Rail

Build recommendations

Best light cones

Best relics

Best planar ornaments

Best stats & substats

Best stats

Body: CRIT Rate / CRIT DMG:
Feet: Speed:
Planar sphere: Imaginary DMG:
Link rope: ATK%:

Best substats

Priority 1: CRIT Rate / CRIT DMG
Priority 2: Speed
Priority 3: ATK%
Priority 4: Effect RES

Skills

Basic ATK Mind is Might

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Deals Imaginary DMG equal to 50% of Dr. Ratio's ATK to one designated enemy target.

Skill Intellectual Midwifery

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Deals Imaginary DMG equal to 75% of Dr. Ratio's ATK to one designated enemy target.

Ultimate Syllogistic Paradox

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Deals Imaginary DMG equal to 144% 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.

Talent Cogito, Ergo Sum

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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 135% 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.

Technique Attack

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Attacks an enemy, and after entering combat, reduces their Toughness of the corresponding Type.

Technique Mold of Idolatry

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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.

Passive talents

Major trace Summation

Ascension 2

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).

Major trace Inference

Ascension 4

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).

Major trace Deduction

Ascension 6

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%.

Minor trace ATK +28%

Minor trace CRIT Rate +12%

Minor trace DEF +12.5%

Dupes / advancement

Rank 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.

Rank 2 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.

Rank 3 Know Thyself

Ultimate Lv. +2, up to a maximum of Lv. 15. Basic ATK Lv. +1, up to a maximum of Lv. 10.

Rank 4 Ignorance Is Blight

When triggering the Talent, additionally regenerates 15 Energy for Dr. Ratio.

Rank 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.

Rank 6 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%.

Materials summary

Arrow of the Beast Hunter
Arrow of the Demon Slayer
Arrow of the Starchaser
Conqueror's Will
Credit
Past Evils of the Borehole Planet Disaster
Thief's Instinct
Tracks of Destiny
Usurper's Scheme