Bone Legion

Large undead, chaotic evil
Armor Class 15 (natural armor)
Hit Points 142 (15d10 + 60)
Speed 30 ft., fly 30 ft. (hover)

STR	DEX	CON	INT	WIS	CHA
18 (+4)	10 (+0)	18 (+4)	6 (−2)	10 (+0)	5 (−3)

Damage Vulnerabilities bludgeoning
Damage Immunities poison
Condition Immunities charmed, exhaustion, frightened, paralyzed, petrified, poisoned
Senses darkvision 60 ft., passive Perception 11
Languages —
Challenge 6 (2,300 XP)

Perpetuity of Death. Creatures reduced to 0 hit points by the bone legion must immediately make repeated death saving throws, deciding their fate before their next turn: if they fail three death saving throws before they succeed three, the creature dies immediately, and its flesh is rendered from its bones as the creature is eviscerated by the bone legion. The creature’s own bones are then absorbed into the bone legion, healing the bone legion for an amount equal to half the killed creature's maximum hit point value.

Transmogrification. If the bone legion is subjected to transmutation magic, instead of the intended effect, the bone fragments of the bone legion are fortified, resulting in a +2 bonus to AC and an extra 1d6 damage to all its attacks for 1 minute.

Actions

Spur. Melee Weapon Attack: +6 to hit, reach 5 ft., one or two targets. Hit: 18 (4d6 + 4) piercing damage.

Lash. Melee Weapon Attack: +6 to hit, reach 15 ft., one or two adjacent targets. Hit: 18 (4d6 + 4) slashing damage, and the target is pulled to within 5 feet of the bone legion.

Crush (Recharge 5–6). The bone legion can move its speed in a straight line, barreling into all in its way. Each creature in its path must make a DC 15 Dexterity saving throw. On a failed save, the target takes 36 (5d12 + 4) bludgeoning damage and is knocked prone. On a success, the target takes half as much damage and isn’t knocked prone. When using this action, the bone legion does not provoke opportunity attacks from prone targets, and it doesn’t treat other creature’s spaces as difficult terrain.