Honkai Star Rail Players Can Get Dr Ratio As A Free 5 Star Character
Screenshot: HoYoverse

Honkai Star Rail Dr. Ratio F2P build: Best light cone, relics, and team composition

Dr. Ratio is a super strong DPS unit that can carry your team.

Dr. Ratio is one of the strongest Imaginary characters in all of Honkai Star Rail, and everyone gets him for free! Strong Imaginary characters are hard to come by, so you’ll want to build Dr. Ratio correctly to maximize his DPS output with the right Light Cone and Relics.

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Currently, the only Imaginary character in Honkai Star Rail that isn’t a 5-Star is Yukong, so most players will appreciate having Dr. Ratio on their roster. He specializes in single-target damage since he’s a Hunt character, but he can carry you through most situations with the right build and team composition.

Best Light Cones for Dr. Ratio in Honkai Star Rail

Honkai Star Rail Baptism Of Pure Thought Light Cone
Image: Hoyoverse

As per usual, the absolute best Light Cone for Dr. Ratio is his signature “Baptism of Pure Thought.” If you’re lucky enough to pull this Light Cone from the featured banner, you’ll be able to increase Dr. Ratio’s CRIT DMG by 20-32% with a further 6-10% increase for every debuff the enemy currently has (maximum of three stacks). This also adds the Disputation buff to Dr. Ratio’s Ultimate, increasing his DMG dealt by 36-60% and causing his follow-up attacks to ignore 20-30% of the target’s DEF for two turns.

Honkai Star Rail Only Silence Remains Light Cone
Image: PC Invasion

There are plenty of 4-Star Light Cones that pair beautifully with Dr. Ratio, too, so there’s no need to worry if you don’t have his signature one. “Only Silence Remains” is a solid choice, increasing Dr. Ratio’s ATK by 16-32% and boosting his CRIT Rate by 12-24% if there are two or fewer enemies on the field. There’s also “Return to Darkness,” which boosts his CRIT Rate by 12-24% and gives him a 12-24% chance to dispel an enemy’s buff after a CRIT Hit.

Honkai Star Rail Cruising In The Stellar Sea Light Cone
Image: PC Invasion

Instead of using a 4-Star Light Cone with Dr. Ratio, however, it’s best to save up for the 5-Star “Cruising in the Stellar Sea” at Herta’s Store. It’s worth grinding Simulated Universe for this one since it boosts Dr. Ratio’s CRIT Rate by 8-16% and increases CRIT Rate even further by 8-16% if the target has less than half of their HP remaining. On top of that, defeating an enemy will increase Dr. Ratio’s ATK by 20-40% for three turns. This is a remarkably powerful Light Cone and everyone can claim it for free since it’s a Simulated Universe reward.

Best Relics for Dr. Ratio in Honkai Star Rail

Honkai Star Rail Wastelander Of Banditry Desert Relic
Image: PC Invasion

Since Dr. Ratio is an Imaginary DPS character on the Hunt path, his optimal Relics are pretty straightforward. The easiest Relic setup to use with Dr. Ratio is a full four-piece set of Wastelander of Banditry Desert, which increases his Imaginary DMG by 10% and gives him an even higher CRIT Rate against debuffed enemies with an additional CRIT DMG buff against Imprisoned foes. It’s the usual setup for Imaginary characters, and it works well here.

However, since Dr. Ratio’s main source of damage is his follow-up attack, you can mix two pieces of Wastelander of Banditry Desert with two pieces of The Ashblazing Grand Duke. This still gets you the 10% Imaginary DMG buff but also a 20% increase to follow-up attack DMG, which is a perfect blend for Dr. Ratio.

Honkai Star Rail Firmament Frontline Growth Planar Ornament
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For Planar Ornaments, two sets work well with Dr. Ratio. The first is Firmament Frontline: Glamoth, which increases his ATK by 12% with an even further boost if his SPD reaches 135/160. The other option is Inert Salsotto, which buffs Dr. Ratio’s CRIT Rate by 8% and increases his Ultimate and follow-up attack DMG by 15% on top of that if his CRIT Rate reaches at least 50%. Space Sealing Station and Rutilant Arena are decent picks also if you don’t have any Glamoth or Salsotto pieces with good stats.

Related: How to get Dr. Ratio for free in Honkai Star Rail

Dr. Ratio Stat Priority

Dr. Ratio is an Imaginary Hunt character, so he does well with the same stats as characters like Dan Heng Imbibitor Lunae. Prioritize these stats when hunting for Dr. Ratio’s relics.

  • Body: CRIT Rate/DMG
  • Feet: Speed
  • Planar Sphere: Imaginary DMG%
  • Link Rope: ATK%

Basically, just dump as many stats into CRIT Rate and CRIT DMG while increasing Dr. Ratio’s ATK as much as possible. Some SPD helps, too, but making sure he can deal enough damage is the highest priority.

Best F2P Dr. Ratio Team in Honkai Star Rail

Since Dr. Ratio is a DPS character, he fits well with just about any set of supports. You can just focus on leveling up his Traces and giving him good Relics since he’ll be doing most of the work. Here’s a good F2P team to use with Dr. Ratio.

  • Dr. Ratio
  • Tingyun
  • Asta
  • March 7th

Basically, any team with Dr. Ratio needs some kind of sustain to keep him alive and a support unit that maximizes his damage output. You could use an Abundance character like Natasha instead of March 7th, for example, and you’d still get the same effect. Yukong is also another solid buffer instead of Asta. With that in mind, here’s a second F2P team for Dr. Ratio.

  • Dr. Ratio
  • Yukong
  • Pela
  • Natasha

Dr. Ratio Skills Explained

These are Dr. Ratio’s skills with their stats upgraded to level 10 as they were in his playable section during Version 1.6’s Trailblaze missions.

SkillEffect (at level 10)
Basic Attack: Mind is MightDeals Imaginary DMG equal to 100% of Dr. Ratio’s ATK to a single target enemy.
Skill: Intellectual MidwiferyDeals Imaginary DMG equal to 150% of Dr. Ratio’s ATK to a single target enemy.
Ultimate: Syllogistic ParadoxDeals Imaginary DMG equal to 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.
Talent: Cogito, Ergo SumWhen 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 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.
Technique: Mold of IdolatryAfter using Technique, creates a special dimension that Taunts nearby enemies, lasting for 10 seconds. 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 Eidolons

E1: Pride Comes Before a FallThe 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 DetailsWhen 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 ThyselfUltimate Lv. +2, up to a maximum of Lv. 15. Basic ATK Lv. +1, up to a maximum of Lv. 10.
E4: Ignorance is BlightWhen triggering the Talent, additionally regenerates 15 Energy for Dr. Ratio.
E5: Sic Itur Ad AstraSkill Lv. +2, up to a maximum of Lv. 15. Talent Lv. +2, up to a maximum of Lv. 15.
E6: Vincit Omnia VeritasIncreases the trigger count for Wiseman’s Folly by 1. The DMG dealt by the Talent’s follow-up attack increases by 50%.

Dr. Ratio is one of the strongest Imaginary characters in all of Honkai Star Rail by default, but if you build him with the right Relics and Light Cone, he can carry you through the hardest stages of the Forgotten Hall. His role in future Trailblaze missions remains to be seen, but as it stands, the Honkai Star Rail community should be very happy with Dr. Ratio.

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Diego Perez
Currently serving as a Senior Staff Writer at PC Invasion, Diego Perez has been writing about video games since 2018, specializing in live service games like Destiny and Final Fantasy XIV. His work is featured at publications like Game Rant and Attack of the Fanboy (where he served as Associate Editor), but PC Invasion is home to his best work. When he's planning content or writing guides, he's yelling about Ape Escape or grinding Lost Sectors in Destiny. Plus, he has a Bachelor of Science in Telecommunication Media Studies for Texas A&M University.