Nihilister
Fire 
Sniper Rifle 
Attacker 
Burst 2 
Pilgrim Tier 5 Burning Shot
■ Activates when attacking with Full Charge. Affects self.
Gain Pierce for 1 round(s).
Piercing Radius ▲ 50% for 1 round(s).
■ Activates when a normal attack hits 2 or more enemies concurrently. Affects all enemies hit.
Deals 50.33% of final ATK as additional damage.
Megiddo Flame (Cooldown: 10s)
■ Affects enemy unit(s) within attack range.
Deals 112.64% of final ATK as damage.
Burning Scourge
■ Affects enemies within the attack range.
Deals 158.59% of final ATK as damage.
Burn: Deals 13.19% of final ATK as sustained damage every 1 sec for 10 sec.
■ Affects self.
Max Ammunition Capacity ▲ 6 round(s) for 15 sec.
Skill recommendations
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.
Extra notes
By today's standards, a really bad kit that's just underwhelming on most (if not all) PVE content. Invest only if she is your waifu.