Split Chamber - More flamey goodness = crispy mobs
Serration - Damage
Point Strike - Critical Chance as we apply status to the enemy for more crispy foes
Hammer Shot - Increases our status chance to produce double status and/or ensure we nearly always apply the radiation/viral procs. Also increases critical damage.

Quad elementals to produce radiation/viral. If it doesn't melt it'll turn to it's buddies and start melting them for you.

Edit:

Updated for use with Arcanes/Galvanized mods.

-Dodo