Honkai: Star Rail – Dr. Ratio build and ascension guide

Become an insufferable lord of memes with the best Honkai: Star Rail Dr. Ratio build and show all doubters the L. Adding the 5-Star character following the Path of The Hunt and dealing Imaginary DMG to your arsenal is a great idea, as he can kick any Follow-Up Attack team into overdrive.

Dr. Ratio’s Skill, Intellectual Midwifery, deals Imaginary DMG to a single target. His Talent, Cogito, Ergo Sum, gives him a fixed 40% chance to launch a Follow-Up Attack after using his Skill, against the same target dealing Imaginary DMG. Both are based on his ATK. Each debuff on the target increases the chance to launch a Follow-Up Attack by 20%.

His Ultimate, Syllogistic Paradox, deals Imaginary DMG based on his ATK to a single target and applies Wiseman’s Folly. If Dr. Ratio’s allies attack an enemy affected by Wiseman’s Folly, he’ll use his Follow-Up Attack against this target. This can be triggered two times and only affects the latest enemy to be hit by his Ultimate.

Dr. Ratio’s Eidolon Levels, which are obtained by pulling additional copies of him, further boost his effectiveness. Eidolon 1 allows him to stack additional buffs from his Summation Trace and Eidolon 2 enables his Follow-Up Attack to deal additional damage for each debuff on the target. Eidolon 4 regenerates Energy for Dr. Ratio when his Talent is used. Finally, Eidolon 6 increases the amount of times Wiseman’s Folly can be triggered by one. In addition, his Follow-Up Attack’s damage is increased by a staggering 50%.

Honkai: Star Rail – Dr. Ratio: best Light Cones

Dr. Ratio has a signature Light Cone, which is called Baptism of Pure Thought and provides a powerful boost to CRIT Rate. In addition, it increases the wearer’s CRIT DMG for every debuff on the enemy target, stacking up to three times. When using their Ultimate, the wielder receives the Disputation effect for two turns, which increases the overall damage dealt by them as well as allowing their Follow-Up Attacks to partially ignore the enemy’s DEF.

This is a beastly offensive Light Cone that perfectly complements Ratio’s playstyle.

Best Light Cones for Dr. Ratio in HSR:

• Baptism of Pure Thought (5-Star)
• Worrisome, Blissful (5-Star)
• I Venture Forth to Hunt (5-Star)
• Cruising in the Stellar Sea (5-Star)
• Sleep Like the Dead (5-Star)
• Final Victor (4-Star)
• Return to Darkness (4-Star)
• Subscribe for More! (4-Star)

Honkai: Star Rail – Dr. Ratio: best Relics

Dr. Ratio is a classic damage dealer in terms of stats, as he’ll want to hog as much CRIT Rate, CRIT DMG, ATK, and SPD as he can get.

Best Relic Sets for Dr. Ratio in HSR:

• The Ashblazing Grand Duke (4) – +20% Follow-Up Attack DMG, +6% ATK whenever the wearer’s Follow-Up Attack deals damage; this effect stacks up to eight times, lasts for three turns, and is removed the next time a Follow-Up Attack is used.
• Pioneer Diver of Dead Waters (4) – +12% damage to debuffed enemies, +4% CRIT Rate, +8%/12% CRIT DMG against enemies affected by 2/3 debuffs; after the wearer inflicts a debuff on enemies, these effects increase by 100% for a turn.
• Wastelander of Banditry Desert (4) – +10% Imaginary DMG, +10% CRIT Rate, +20% CRIT DMG when attacking Imprisoned enemies.

Best Planar Ornaments for Dr. Ratio in HSR:

• Duran, Dynasty of Running Wolves (2) – +5% Follow-Up Attack DMG for the wielder whenever a stack of Merit is gained, up to five times. Merit is obtained by allies making Follow-Up Attack attacks; +25% CRIT DMG for the wearer upon reaching five stacks of Merit.
• Inert Salsotto (2) – +8% CRIT Rate, +15% Ultimate and Follow-Up Attack DMG when the wearer’s CRIT Rate surpasses 50%.

Best stats for Dr. Ratio in HSR:

• Head – HP (Primary), CRIT Rate, CRIT DMG, ATK %, SPD
• Hands – ATK (Primary), CRIT Rate, CRIT DMG, ATK %, SPD
• Body – CRIT Rate (Primary), CRIT DMG, ATK %, SPD, Break Effect
• Feet – SPD (Primary), CRIT Rate, CRIT DMG, ATK %, Break Effect
• Planar Sphere – Imaginary DMG (Primary), CRIT Rate, CRIT DMG, ATK %, SPD
• Link Rope – ATK % (Primary), CRIT Rate, CRIT DMG, SPD, Break Effect

Honkai: Star Rail – Dr. Ratio: best teams

Using Dr. Ratio to his full effect requires you to bring a character that can debuff the enemy, which will enable the damage dealer to consistently unleash Follow-Up Attacks.

• Dr. Ratio (Main DPS), Topaz (Sub DPS), Robin (Support), Aventurine (Support)

Dr. Ratio benefits massively from Topaz, as she not only inflicts a status on enemies that counts as a debuff, this status also buffs Follow-Up Attacks against the affected target — a win-win for the doctor. Add into the mix the offensive boosts coming from Robin as well as the steady protection of Aventurine and you’ve got one of the most solid team compositions in the entire game going.

Silver Wolf and Pela are great with Dr. Ratio as well, since they can easily debuff enemies to get his Follow-Up Attacks flowing.

Honkai: Star Rail – Dr. Ratio: ascension materials

Here’s everything you need to know to get Dr. Ratio ascended to the maximum level and upgrade all of his talents.

Dr. Ratio requires the following ascension materials to get to level 80 in addition to the necessary XP:

• Credits x308,000
• Thief’s Instinct x15
• Usurper’s Scheme x15
• Conqueror's Will x15
• Suppressing Edict x65

You can collect Thief’s Instinct, Usurper’s Scheme, and Conqueror's Will from Antimatter Legion enemies on Herta Space Station as well as the Simulated Universe. You can create or exchange them through the Omni-Synthesizer on the Astral Express, too. Thief’s Instinct is one of the base materials you can easily farm through the Daily Assignments to your characters, making for a steady income of the material. Suppressing Edicts are dropped by the Stagnant Shadow (Artisanship Commission) or gained through the exchange of similarly rare materials. The best source of Credits are the Golden Calyxes found on most worlds.

Dr. Ratio requires the following materials to upgrade her combat abilities and Traces:

• Credits x3,000,000
• Thief’s Instinct x41
• Usurper’s Scheme x56
• Conqueror's Will x58
• Arrow of the Beast Hunter x18
• Arrow of the Demon Slayer x69
• Arrow of the Starchaser x139
• Past Evils of the Borehole Planet Disaster x12
• Tracks of Destiny x8

For the materials already mentioned, check above. Arrows can be farmed in the Crimson Calyx (Outlying Snow Plains). As usual, you can create the high-level materials by using lower-level materials in the Omni-Synthesizer on the Astral Express.

Past Evils of the Borehole Planet Disaster is a boss material only gained from the Echo of War (Seclusion Zone) domain, while Tracks of Destiny can be obtained during time-limited events, the Embers Exchange, the Nameless Honor, or as a Simulated Universe Points Reward.