Eunhwa: Tactical Upgrade
Fire 
Sniper Rifle 
Attacker 
Burst 2 
Elysion Tier 3 Camouflage Scarf
■ Activates when using Burst Skill. Affects self.
Camouflage: Prevents self from being the target of single-target attacks for 5 sec. Loses effect when the caster takes damage.
■ Activates when performing Full Charge attacks. Affects self when entering Full Burst.
Camouflage: Prevents self from being the target of single-target attacks for 5 sec. Loses effect when the caster takes damage.
■ Activates only when in Camouflage status. Affects self.
Normal attacks deal true damage continuously.
True damage ▲ 42.24% continuously.
AS Formation
■ Activates only when self survives.
AS Formation:
Function: Issues a battle-advantageous tactic to target(s).
Effect 1: Affects all allies from the same squad. Critical rate ▲ 8.16% continuously.
Effect 2: Affects all allies. Charge damage ▲ 41.81% continuously.
Effect 3: Affects self. ATK ▲ 42.24% continuously.
Bonus effects when applying LT Formation to self.
Effect 1: Affects all allies. Projectile explosion damage ▲ 5.11% continuously.
Effect 2: Affects all allies. True damage ▲ 30.97% continuously.
Explosive Round
■ Affects self.
Swap Weapon:
Charge time: 0.3 sec
Damage: 105.6% of final ATK as true damage
Full Charge damage: 300% of damage
Max ammunition capacity: 1 round(s)
Special note: Fires an Exploding Bullet dealing area-of-effect damage.
Additional effect:
Target: Target(s) hit
Effect: Explosive Round - Damage taken ▲ 27.87% for 10 sec.
Skill recommendations
Build
CUBES
Resilience cube for faster reload times or Rupture (if high level enough) for the extra True DMG.
OL GEAR
She's built as a DPS, so the usual Elemental DMG and ATK take priority. Max ammo and crit lines can be used as fillers.
Solo Raid Usage
This is based on the top 50 players of all NIKKE servers combined. Data is from enikk.app, check their website for a lot more raid data.
Pros & Cons
- Not only she provides A LOT of buffs when paired with Emma: Tactical Upgrade, she's also a great damage dealer on her own, making the duo increase their value in contrast to previous ones (bunnies, JKs, etc.)
- Both of them are pretty cheap to build if you just want them to 'work', since you can go 4/7/7 and stop there until you get more resources
- She can't be targeted by single target attacks thanks to her Concealment (splash damage can still get her)
- Can't really be used for PVE content without Emma: Tactical Upgrade since you just lose a huge part of her kit