Trina
Trina is a Electric Nikke in the Supporter class, manufactured by Missilis. Stats and skill text below come straight from the game's data.
Burst II
Nature's GraceSkill 1
After Full Burst ends: all allies recover 4.06% of caster's final Max HP per second for 5 sec. Full Charge: if 2 lowest-HP allies below 30% HP, restore 2.03% Max HP; at 50% threshold, 1.57%.
Peaceful TreeSkill 2
At battle start: all Electric Code rifle allies Max HP +44.98% of caster's Max HP. Leftmost gains 2-sec invulnerability. On Burst use: that ally Attack Damage +94.15% and Reloading Speed +50.82% for 10 sec.
Mother ForestBurst Skill
20 sec cooldown. All allies Max HP +20.14%, Attack Damage +20.9% for 10 sec. Vs single non-Nikke: Burst damage +435.6%. Electric rifle allies gain 45.3% Hit Rate and 20 ammo for 10 sec.
Prioritize Burst (Mother Forest) first for team-wide HP/ATK buffs and heavy Full Burst damage, then S2 (Peaceful Tree) for Electric rifle Max HP and ATK/reload buffs on Burst use, and S1 (Nature's Grace) last since it's post-Burst sustain healing.
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