Fallen Health: The Dark Legionnaire can go above its max hit points using its Fallen Lifesteal attack.

Multiattack. The Dark Legionnaire makes two tentacle attacks.

Clone: When a Dark Legionnaire is at or above its max hit points, it can use an action to split in two, dividing the total hit points equally. The clone then takes its full turn.

Fallen Lifesteal. Tentacle Attack: +4 to hit, reach 15 ft., one target. Hit: 8 (1d8 + 4) piercing damage. The Dark Legionnaire  heals an amount equal to the damage dealt.

Shadow Stealth. While in dim light or darkness, the Dark Legionnaire takes the Hide action.

Fallen Targeting: As a bonus action the Dark Legionnaire can make an Insight check DC 10 on all enemies within 60 feet. On a successful check, the Dark Legionnaires know the AC of their enemies and target the enemy with the lowest AC.

Fallen Rebirth: When the Dark Legionnaire takes damage that does not reduce its health to zero, it splits into two, splitting the remaining hit points.