Honkai Star Rail: Dr Ratio Best Build Guide, Kit & Teams

ATK

Mind is Might

• Deals Imaginary DMG equal to 50% (100%) of Dr. Ratio’s ATK to a single target enemy.

skill

Intellectual Midwifery

• Deals Imaginary DMG equal to 75% (150%) of Dr. Ratio’s ATK to a single target enemy.

ULT

Syllogistic Paradox

• Deals Imaginary DMG equal to 144% (240%) 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.

TECH

Mold of Idolatry

• After using this 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.

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% (270%) 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.

trace 1

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).

trace 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).

trace 3

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%.

Baptism of Pure Thought

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

Swordplay

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

  • Best option after Dr. Ratio's Signature. A solid boost in DMG given that he often attacks only the marked enemies. However, to get the most out of it you need to have more copies. This Light Cone shines if you have it at S3+

Cruising in the Stellar Sea

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

  •  Great F2P option, given that players can get it to max completely free from the Simulated Universe, nonetheless, the ATK increase activation is a bit limited, as well as the additional CRIT rate boost, but overall a solid choice.

The Ashblazing Grand Duke

• 2-Piece: Increases the DMG dealt by follow-up attacks by 20%.
• 4-Piece: When the wearer uses follow-up attacks, increases the wearer's ATK by 6% for every time the follow-up attack deals DMG. This effect can stack up to 8 time(s) and lasts for 3 turn(s). This effect is removed the next time the wearer uses a follow-up attack.

  • The follow-up attack DMG provided by this set is insane for Dr. Ratio and gives him a lot of utility. And with the ammount of follow-up attacks he launches, he will stack it up quite fast

Genius of Brilliant Stars

• 2-Piece: Increases Quantum DMG by 10%.
• 4-Piece: When the wearer deals DMG to the target enemy, ignores 10% DEF. If the target enemy has Quantum Weakness, the wearer additionally ignores 10% DEF.

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.

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%.

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.

Space Sealing Station

• 2-Piece: Increases the wearer's ATK by 12%. When the wearer's SPD reaches 120 or higher, the wearer's ATK increases by an extra 12%.