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Honkai: Star Railhas done something nobody expected by giving Dr. Ratio for free to celebrate the awards they received. you may only get this character for free until the 2.1 update, but you get to keep him for a lifetime if you claim him within this time.
Dr. Ratio is an Imaginary unit following the path of The Hunt. He relies on follow-up attacks as his main source of damage, but the flexibility in his teams and overall requirements make him quite easy to build.

Best Dr. Ratio Relics And Planar Ornaments
Once you claim Dr. Ratio, if you’ve already reached the endgame of Honkai: Star Rail,the first thing you’d want to put on him are the Relics. These are the main sources for your HP, ATK, and Crit boost. You can get some unique buffs for stacking a certain type of pieces on Dr. Ratio, and here are the best ones:
Relics
Wastelander of Banditry Desert
This set gives Dr. Ratio a ten percent Crit Rate for free while attacking an enemy with a debuff,which goes along very well with his kit. This can reduce the amount of Crit you need to build on his Relic stats.
Other than that, it’ll also give you a20 percent Crit DMG bonus against Imprisoned enemies, but you’ll have to break their Weakness with him for this to work.

Genius of Brilliant Stars
This will be your second-best Relic set for Dr. Ratio, especiallyif you’re fighting an enemy with Quantum Weakness. Unfortunately, the two-piece bonus for this set will be useless for him.
However, the 20 percent DEF shred that he can get with the four-piece is one of the best buffs in the game. Thisalso stacks with the DEF shred from his Light Cone.
The Ashblazing Grand Duke
This is also a decent set for Dr. Ratio, but it’llgive you much less value compared to Wastelander. This set only buffs his follow-up DMG and the ATK bonus from the four-piece stacks very slowly on him.
Double ATK Percent Pieces
Finally, if you don’t have a proper four-piece set for him,you can use two pieces of each set that give you ATK Percent. You can also use one two-piece for SPD and one for ATK.
Planar Ornaments
Firmament Frontline: Glamoth
This set gives you 12 percent ATK and DMG as long as you have 135 or more SPD. you’re able to evenincrease this DMG bonus to 18 percentif you somehow manage to get 160 SPD.
This set works great on Dr. Ratio since you’d want him to have high SPD to trigger his follow-ups more often.
Inert Salsotto
If you don’t want to farm the Glamoth set, you can also use Inert Salsotto since it gives you a follow-up and Ultimate DMG increase,which are two of the three main sources for his DMG.
Unfortunately, the Crit Rate from this set isn’t that important since Dr. Ratio gets the Crit Rate from his Traces and Wastelander.
Space Sealing Station
This is a beginner Ornament set that you may use on Dr. Ratio if you don’t have anything else. Itgives you 24 percent ATK as long as you have 120 SPD, which isn’t hard to get.
Dr. Ratio Relic Stat Priority
Now that you know the general Relics and Planar Ornaments that you need to farm for him,the next step is to get the correct Relic stats. Dr. Ratio is a DPS character, meaning that you’ll have quite a few stats that you need including SPD, ATK, Crit DMG, and Crit Rate. you may also run into situations where you’ll have too much Crit Rate with this character.
It can be difficult to balance, but here’s what you should look for:
HP (guaranteed)
ATK (guaranteed)
ATK Percent
Crit DMG > Crit Rate > SPD
Ideally, you’d want to have about a60 percent Crit Rate on himif you’re using the Wastelander set.
This is because his passive cangive him a whopping 15 percent Crit Rate.
Best Dr. Ratio Light Cones
The next step is to get the best Light Cone you possibly can for Dr. Ratio. There arequite a few Light Cones that are decent for this character, but hardly any that suit him perfectly. Here are your best choices:
Baptism of Pure Thought
Being Dr. Ratio’s signature Light Cone, this works perfectly on him as it cangive him up to 44 percent Crit DMG in the correct situation. It also buffs his DMG upon using the Ultimate and lets his follow-up attacks ignore the target’s DEF.
Worrisome, Blissful
You can get up to 18 percent Crit Rate and24 percent Crit DMG with this Light Cone at Refinement One. However, as you’ve seen above, Dr. Ratio doesn’t necessarily need any more Crit Rate.
It can still be adecent choice for himbecause of the follow-up DMG increase.
Cruising in the Stellar Sea
This is an F2P-friendly Light Cone thatyou can easily get to Refinement Fivethrough the Simulated Universe. However, it once again gives you a bunch of Crit Rate that you might not need.
The ATK boost fromthe latter part of its passive makes it the best choiceif you don’t have the two Light Cones above.
Swordplay
This is a phenomenal Light Cone for Dr. Ratio if you’re fighting boss enemies because of itspotential to give you up to an 80 percent DMG increase.
River Flows in Spring
You can use this Light Cone if you’re using Dr. Ratiowith a shielder like March 7th or Gepard. It gives you a constant SPD and DMG boost as long as you don’t take DMG.
Adversarial
This Light Cone gives you18 percent SPD every time you defeat an enemy, which can be good when he’s fighting against a horde of enemies.
Dr. Ratio Trace Priority
Using Harmony characters as the main supports has been Honkai: Star Rail’s meta ever since the beginning since they alwaysprovided more value than putting a debuff on an enemywith Nihility characters. Thankfully, Dr. Ratio changes this up because his kit revolves around placing as many debuffs on the enemy as possible:
Keep in mind thatDoT, Freeze, and Imprison effectsalso count as debuff.
All these special effects in his kit can be found in the Bonus Abilities of his Traces, sothey take priority when you’re upgrading his Traces. If you see a Bonus Ability that you can unlock at your current ascension, you should always go for those first since they provide a significant buff.
After you’ve unlocked all the Bonus Abilities, his Talent takes the next priority asit increases the DMG of his follow-up attack, which is his main source of DMG. Finally, you can upgrade your Skill and Ultimate in any order since it doesn’t make a lot of difference.