@naberiustar Melt is probably gonna be the most reliable, overload it would probably be hard to keep the Rez shred up with only Iansan as electro, if you were to do vape, I would Mona for yelan and Fischl for kazuha, unless you are doing overvape (overload + vape)
Lava: Geo + Pyro
If you hit a pyro crystalize shard with Pyro, Lava occurs creating a small pool of molten rock, dealing dmg to targets inside. Only three pools of lava can occur at a time.
(Tried to make crystallize at least a bit useful)