Sapphiron is a gigantic undead dragon who guards the entrance to Kel'Thuzad's inner sanctum in Naxxramas (original). Previously a member of the Blue Flight, Sapphiron is the final defense to Kel’Thuzad’s room. He holds a rich backstory within the Warcraft series and provides an epic battle that was previous unseen to WoW. Those who make it past all of the other thirteen bosses will face something far past what they expect.