The LostMedium monstrosity
Arm Spike. Melee Weapon Attack: +6 to hit, reach 1 m. Hit: 14 (2d10 + 3) piercing damage.
Embrace (1/turn). Melee Weapon Attack: +6 to hit, reach 1 m. Hit: 25 (4d10 + 3) piercing damage, and the target is grappled (escape Difficulty 14) if it is a Medium or smaller creature. Until the grapple ends, the target is frightened, and it takes 27 (6d8) psychic damage at the end of each of its turns. The Lost can embrace only one creature at a time.
Tightening Embrace. If the Lost takes damage while it has a creature grappled, that creature takes 18 (4d8) psychic damage.
No concoctions, maneuvers, or spells
All creatures in this system should have maneuvers or spells. You should add some maneuvers or spells to this creature. If you do so, please make a suggestion on github so I can finish adding maneuvers and spells to all creatures via https://github.com/mlenser/kryx-rpg-issues/issues/9.