I Am the Undead Cataclysm

When monsters flood the world and the class change era arrives, Lucas awakens as a rare Necromancer whose summoned undead carry no cooldowns and pass their damage along to their summoner. His unusual power sets him apart in a world where ordinary awakened fighters are measured by their class and rank. Lucas must learn to command his army of the dead while the chaos of the monster invasion pushes him toward a fight that will define his place in the new order.