Un-Man

Absorb Life Energy. If the un-man remains within 60 feet of a creature it can sense for 1 hour, it can absorb some of that creature’s life energy if the creature isn’t a construct or an undead. It can absorb life energy from only one creature each hour. The creature’s hit point maximum is reduced by 2 (1d4) until it finishes a long rest. The creature dies if its hit point maximum is reduced to 0.
Incorporeal Movement. The un-man 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.

Strangle. Melee Spell Attack: +5 to hit, reach 10 ft., one creature. Hit: The un-man attaches to the target. While attached, the un-man’s speed is 0, it can’t benefit from
bonuses to its speed, it moves with the target, it can’t strangle another target, and the target can’t breathe or speak.
At the start of each of its turns, the creature loses 6 (1d6 +3) hit points if it requires air to live. The strangled creature can detach the un-man with a successful DC 13 Dexterity (Acrobatics) check as an action. The un-man can detach itself by spending 5 feet of movement.

Absorb Magic. When a creature within 60 feet that it can perceive casts a spell, the un-man absorbs some of the spell’s magic before the spell takes effect. Attack rolls for the spell are made with disadvantage and saving throws against the spell are made with advantage.