Since Yujin is a 'healer' type of descendant, all his skills give allies 'buffs', so by using the mod 'Passionate Sponsor' you get +75% extra Firearm ATK by healing allies.

A little Tip that most people ignore, assuming you have a single ally, the moment you cast your 4th ability, you get 2 stacks, The initial Burst heal gives 1, and the initial Heal Over Time, and every single time it does another Heal Over Time tick, you refresh the buff and add a stack.
Meaning, if you're doing Intercept Colossus and cast the heal, you will get 6 total stacks in less then a second, 3Burst + 3HoT, and the next HoT tick, you get +3 stacks.

TLDR: You get the 10 Stacks in less than 2 seconds of casting the ability when you have 3 allies.






















You would also be using 'Shot Focus' Mod, which gives +15% Firearm ATK, totaling 90% with both mods. The Minus power modifier is minimal, so you can ignore it.

For the last slot you would need 1 or 2 more Catalysts (on the sub-module and either on shot-focus or the empty slot), and its the user preference what to equip.
For example you could use Focus on Fusion, for a little more cooldown and Fusion boost.
More cooldown, or another reduced cost, maybe more DEF or Shields.






These are the Stats i have at lvl 40 + the externals and mods shown

On the Reactor you will want the main sub-stat to be Cooldown, then you can either use non-attribute+fusion boost, more duration, reduced cost sub-stat, i've chosen this one because it was the best i have at the moment.

The Ideal one for me that i would prefer to use, is a Non-Attribute + Fusion Main Stats, with sub-stats of Cooldown + Reduced Cost.

Slayer Set from HM Pyromaniac

One thing that the Tooltip doesnt show, is that when you equip the Transcendent Mod, it alters the skill to have 150meters range, that is the reason i do not use Range mods on this Build, its mostly to keep the +90% Firearm ATK contantly.
The cooldown refreshes before the buff of Passionate Sponsor ends, meaning 100% uptime on the bonus Firearm, while also having plenty of MP to keep casting and healing.













Example of how much it heals in a single cast for reference, its based on the target max HP, but you will almost every single time, heal atleast 80% of the allies max HP, and in case allies are already near max hp, it heals the shields instead, meaning you can also 'heal' allies that focus purely on shield, for example enzo and kyle.

Used the build during Death Stalker farming, its a very good build to heal allies and deal damage, even more so now with DeathStalker's mechanic that reduces Max Hp by 50%-75%.

A Shield based build, due to boss reducing 50%-75% Max HP, through debuffs, while ditching the firearm atk mods for facetanking Deathstalker
Giving 32k shields

These External Set Pieces provide Main HP as the Main stat, for those that have yet to reach and kill Deathstalker for his external pieces.
This list is only from Colossi Sets, not accounting for Random Weekly Drops from rotator, same as reactors.

-------------------------------------------------------------------------------------------------------
Auxiliary
- Name: Polar Night
- Drop from Dead Bride
- Amount: 484 Max HP

- Name: Invader and Distorted
- Drop both from Death Stalker
- Amount: Both 646 Max HP

-------------------------------------------------------------------------------------------------------
Sensor
- Name: Volcanic Sensor
- Drop Molten Fortress
- Amount: 646 Max HP

- Name: Frozen Heart
- Drop Frost Walker
- Amount: 646 Max HP

- Name: Polar Night Sensor
- Drop Dead Bride
- Amount: 484 Max HP

- Name: Invader and Distorted
- Drop both from Death Stalker
- Amount: Both 484 Max HP

-------------------------------------------------------------------------------------------------------
Memory
- Name: Volcanic Memory
- Drop From Molten Fortress
- Amount: 484 Max HP

- Name: Annihilation Memory
- Drop From Devourer
- Amount: 646 Max HP

- Name: Invader and Distorted
- Drop both from Death Stalker
- Amount: Both 484 Max HP

-------------------------------------------------------------------------------------------------------
Processor
- Name: Hungry Sonic Processor
- Drop From Gluttony
- Amount: 484 Max HP

- Name: Venom Essence
- Drop From Swamp Walker
- Amount: 484 Max HP

- Name: Polar Night
- Drop From Dead Bride
- Amount: 646 Max HP

- Name: Slayer
- Drop From Pyromaniac
- Amount: 646 Max HP

- Name: Annihilation
- Drop From Devourer
- Amount: 484 Max HP

- Name: Invader and Distorted
- Drop both from Death Stalker
- Amount: Both 646 Max HP
-------------------------------------------------------------------------------------------------------

HAILEY ZENITH https://cs2bus.com/sharedfiles/filedetails/?id=3339019741
BUNNY BUILDS https://cs2bus.com/sharedfiles/filedetails/?id=3339025477
YUJIN DUTY AND SACRIFICE https://cs2bus.com/sharedfiles/filedetails/?id=3343004395
FREYNA MOBBING AND BOSSING https://cs2bus.com/sharedfiles/filedetails/?id=3349063563