Horde. The legion can occupy another creature's space and vice versa, and the legion is immune to any spell or effects that would alter its form.

Reactive. The legion can take one reaction on every turn in combat.

Incorporeal Movement. The legion can move through other creatures and objects as if they were Difficult Terrain. It takes 5 (1d10) force damage if it ends its turn inside an object.

Turn Resistance. The legion has advantage on saving throws against any effects that turn undead. 

Multiattack. The legion makes four attacks, or two attacks if the legion has half its hit points or fewer. 

Swords. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 3) slashing damage. 

Spears. Melee Weapon Attack: +6 to hit, reach 10 ft., one target. Hit: 7 (1d8 + 3) piercing damage. 

Heavy Crossbow. Ranged Weapon Attack: +5 to hit, range 100/400 ft., one target. Hit: 8 (1d10 + 3) piercing damage.