Undead Fortitude. If damage reduces the corpse king to 0 hit points, it must make a Constitution saving throw with a DC of 5+the damage taken, unless the damage is radiant or from a critical hit. On a success, the corpse king drops to 1 hit point instead.
Slam. Melee Weapon Attack: +6 to hit, reach 10 ft., one target. Hit: 14 (3d6 + 4) bludgeoning damage.
Undead Hierarchy. The Corpse King can attempt to gain control of a number of undead whose combined challenge rating is less than or equal to its own. The undead must make a DC 12* charisma saving throw (if they already are controlled they may use their master's spellcasting ability and proficiency modifier instead) or become dominated by the corpse king, following its verbal commands to the best of their abilities.
*Or the corpse king's master's spell save DC if that's higher. Whenever the corpse king's charisma modifier increases the default DC increases by that much as well.
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