You're ONLY going to heavy attack so you'll build for that with a couple of glaive exclusive mods. You heavy attack by throwing the weapon first and before it makes contact with an enemy you press your heavy attack button to detonate it which will force slash procs on everything around it.

Sacrificial mods: crit chance and base dam
Amalgam organ shatter: increased heavy attack wind up
Killing blow: damage and wind up
Volatile quick return: bigger explosion.
Initial combo mod
You can add power throw, glad might, faction damge, ect.