Slags are lava golems summoned by Gom during his final battle in the Vault of Eternity. Level 105 combat mages can summon them for themselves, if they have the mana to do so.
Dungeon Siege Wiki
Slags are lava golems summoned by Gom during his final battle in the Vault of Eternity. Level 105 combat mages can summon them for themselves, if they have the mana to do so.