Honkai: Star Rail Dr. Ratio Character Guide

Introduction

Dr. Ratio is a DPS character that deals follow-up attacks after he or his allies attack. He can increase his Crit Rate and Crit DMG depending on how many debuffs his enemies have.

Skills Overview

Basic Attack - Mind is Might

Deals Imaginary DMG equal to 50%–110% of Dr. Ratio's ATK to a single target enemy.

Skill - Intellectual Midwifery

Deals Imaginary DMG equal to 75%–165% of Dr. Ratio's ATK to a single target enemy.

Ultimate - Syllogistic Paradox

Deals Imaginary DMG equal to 144%–259.2% 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.

Talent - Cogito, Ergo Sum

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%–297% 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.

Technique - Mold of Idolatry

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.

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).

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).

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%.

Traces Priorities

Talent = Ultimate > Skill > Normal Attack

Recommended Light Cones

1. Baptism of Pure Thought
2. Worrisome, Blissful
3. Cruising in the Stellar Sea
4. Swordplay

1) Baptism of Pure Thought

Increases the wearer's CRIT DMG by 20~32%. For every debuff on the enemy target, the wearer's CRIT DMG dealt against this target increases by 8~12%, stacking up to 3 times. When using their Ultimate to attack the enemy target, the wearer receives the Disputation effect, which increases DMG dealt by 36~60% and enables their follow-up attacks to ignore 24~40% of the target's DEF. This effect lasts for 2 turns.

2) Worrisome, Blissful

Increase the wearer's CRIT Rate by 18~30% and their follow-up attacks' DMG by 30~50%. After the wearer uses a follow-up attack, apply the Tame state to the target, stacking up to 2 stacks. When allies hit enemy targets under the Tame state, every Tame stack increases the CRIT DMG dealt by 12~20%.

3) Cruising in the Stellar Sea

Increases the wearer's CRIT rate by 8~16%, and increases their CRIT rate against enemies with HP less than or equal to 50% by an extra 8~16%. When the wearer defeats an enemy, their ATK is increased by 20~40% for 2 turn(s).

4) Swordplay

For each time the wearer hits the same target, DMG dealt increases by 8~16%, stacking up to 5 time(s). This effect will be dispelled when the wearer changes targets.

Recommended Relics & Planar Set

1. Relics
   • Wastelander of Banditry Desert + The Ashblazing Grand Duke
   • Wastelander of Banditry Desert
2. Planar Set
   • Inert Salsotto
   • Firmament Frontline: Glamoth

Relic Set (Wastelander of Banditry Desert + The Ashblazing Grand Duke)

Wastelander of Banditry Desert 2 Piece: Increases Imaginary DMG by 10%.The Ashblazing Grand Duke 2 Piece: Increases the DMG dealt by follow-up attacks by 20%.

Relic Set (Wastelander of Banditry Desert)

2 Piece: Increases Imaginary DMG by 10%.
4 Piece: When attacking debuffed enemies, the wearer's CRIT Rate increases by 10%, and their CRIT DMG increases by 20% against Imprisoned enemies.

Planetary Set (Inert Salsotto)

2 Piece: Increases the wearer's CRIT Rate by 8%. When the wearer's current CRIT Rate reaches 50% or higher, the wearer's Ultimate and follow-up attack DMG increases by 15%.

Planetary Set (Firmament Frontline: Glamoth)

2 Piece: 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.

Team Recommendations

Dr. Ratio + Nihility + Nihility/Harmony + Survivability

Dr. Ratio: Main DPS
Silver Wolf / Guinaifen / Welt: Debuffer on enemies
Ruan Mei / Asta / Pela: Buffer / Debuffer
Huohuo or any other Abundance/Preservation: Healer / Shielder

Dr. Ratio + Topaz + Nihility/Harmony + Survivability

Dr. Ratio: Main DPS
Topaz & Numby: Follow-up Attack Buffer + Sub-DPS
Silver Wolf / Guinaifen / Ruan Mei / Asta / Welt / Pela: Buffer / Debuffer
Luocha or any other Abundance/Preservation: Healer / Shielder

Eidolons

Best Eidolons: E4 & E6

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 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.

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
Increases the trigger count for Wiseman's Folly by 1. The DMG dealt by the Talent's follow-up attack increases by 50%.