Collei applies Dendro off-field through her Elemental Skill and Burst, making her ideal for enabling Dendro reactions with on-field Pyro, Electro, or Hydro carries. Pair her with a main DPS that can trigger reactions consistently while she handles Dendro application from the off-field. Equip her with an Elemental Mastery–focused bow and Dendro-boosting artifacts to maximize reaction damage from her teammates.