Necromancer is a boss mob of Armored Skeletons in Better Dungeons.
The necromancer has got a lot of health. On top of that he consistently summons skeletons with 25 hp each and shoots shadow orbs at the player that deal damage. Once the boss is engaged it is best to just head in and try to kill the necromancer as soon as possible. If you don't there will be a large skeleton army waiting for you.
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