Firestorm

From Doom Wiki

Firestorm is the Cleric's third weapon from Hexen. It is a spell which launches a streak of flame directly ahead of the player. If it comes into contact with a monster it will explode and spawn a small ring of flames that rotate around the point of impact, which will detonate upon contact with an obstacle or wall, heavily damaging the target and any other monsters within a short radius. The spell uses four Green Mana per shot.

Hexen weapons
Baratus (Fighter)	Spiked Gauntlets	Timon's Axe	Hammer of Retribution	Quietus
Parias (Cleric)	Mace of Contrition	Serpent Staff	Firestorm	Wraithverge
Daedolon (Mage)	Sapphire Wand	Frost Shards	Arc of Death	Bloodscourge