Chimera, Shadow

Shapechanger. The chimera can use its action to polymorph into a Small or Medium humanoid, or back into its true form. Its statistics, other than its size, are the same in each form. Any equipment it is wearing or carrying isn’t transformed. It reverts to its true form if it dies.

Amorphous. The chimera can move through a space as narrow as 1 inch wide without squeezing.

Shadow Stealth. While in dim light or darkness, the chimera can take the Hide action as a bonus action.

Sunlight Weakness. While in sunlight, the shadow has disadvantage on attack rolls, ability checks, and saving throws.

Multiattack. The chimera makes two attacks. It makes one Vitality Drain attack and one Strength Drain attack.

Vitality Drain. Melee Weapon Attack: +5 to hit, reach 15 ft., one target. Hit: 17 (3d8 + 4) necrotic damage and the chimera gains a number of temporary hit points equal to half of the damage dealt.

Strength Drain. Melee Weapon Attack: +5 to hit, reach 5 ft., one creature. Hit: 11 (2d8 + 2) necrotic damage, and the target's Strength score is reduced by 1d4. The target dies if this reduces its Strength to 0. Otherwise, the reduction lasts until the target finishes a short or Long Rest.
If a non-evil Humanoid dies from this Attack, a shadow rises from the corpse 1d4 hours later. 

Reversal. When a creature the chimera can see within 30 feet of it regains hit points, the chimera reduces the number of hit points regained by half, and the chimera deals 10 (3d6) necrotic damage to the creature.