Yelan applies Hydro off-field through her Elemental Burst while dealing significant damage herself, making her a strong sub-DPS and vaporize enabler for on-field Pyro carries. Pair her with main DPS characters like Hu Tao or Alhaitham who benefit from consistent off-field Hydro application. Build for HP and Crit, prioritize Elemental Burst uptime, and use weapons like Aqua Simulacra or Favonius Warbow to balance damage and energy needs.