Monarch Skeleton

Medium Undead neutral evil

STR	DEX	CON	INT	WIS	CHA
21 (+5)	14 (+2)	20 (+5)	12 (+1)	14 (+2)	8 (-1)

Saving Throws: Wis +6
Skills:
Damage Immunities: necrotic, poison
Damage Resistances: bludgeoning, piercing, and slashing from nonmagical attacks not made with silver
Condition Immunities: charmed, exhaustion, paralyzed, petrified, poisoned
Senses: darkvision 120 ft., passive Perception 12
Languages: the languages it knew in life

Master Tactician: The monarch skeleton and any skeletons within 30 feet of it have advantage on attack rolls against a creature if at least one of the skeleton's allies is within 5 feet of the creature and the ally isn't incapacitated.
Sovereign's Command: As a bonus action, the monarch commands a skeleton within 30 feet of it to make one attack as a reaction against a creature the monarch attacked this round.
Turning Defiance: The monarch skeleton and any skeletons within 30 feet of it have advantage on saving throws against effects that turn undead.

Multiattack: The monarch skeleton makes two dreadblade attacks.
Dreadblade: Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 14 (2d8 + 5) slashing damage plus 7 (2d6) necrotic damage. If the target is a creature, it must succeed on a DC 17 Constitution saving throw or its hp maximum is reduced by an amount equal to the necrotic damage taken. This reduction lasts until the creature finishes a long rest. The target dies if this effect reduces its hp maximum to 0.
Grasp of the Grave (Recharge 5-6): Each non-skeleton creature within 30 feet of the monarch must succeed on a DC 16 Dexterity saving throw or be restrained by ghostly, skeletal hands for 1 minute. A restrained target takes 10 (3d6) necrotic damage at the start of each of its turns. A creature, including the target, can take its action to break the ghostly restraints by succeeding on a DC 16 Strength check.