Blood Zombie

Undead Fortitude. If damage reduces the zombie to 0 hit points, it must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is radiant or from a critical hit. On a success, the zombie drops to 1 hit point instead.

Regeneration. The zombie regains 5 hit points at the start of its turn if it has at least 1 hit point. If the zombie takes radiant damage, this trait doesn’t function at the start of it’s next turn.

Multiattack. The zombie makes two bloody claw attacks, or one bloody bite attack.

Bloody Claw. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 4 (1d6 + 1) slashing damage. A creature damaged by this attack is poisoned until the end of their next turn.

Bloody Bite. Melee Weapon Attack: +3 to hit, reach 5 ft., one creature. Hit: 4 (1d6 + 1) piercing damage plus 3 (1d6) necrotic damage. The target’s hit point maximum is reduced by an amount equal to the necrotic damage taken, and the zombie regains hit points equal to that amount. The reduction lasts until the target finishes a long rest. The target dies if this effect reduces its hit point maximum to 0.

Channel Blood (Recharge 6).  The zombie channels its blood into a nearby creature, healing it if it is an ally, and hurting it if it is a foe. Targets one other creature within 10 ft. of the zombie, dealing 9 (3d6) necrotic damage if it is hostile to the zombie, or healing 6 (2d6) hit points if it is friendly to it. Afterwards, the zombie takes 3 (1d6) radiant damage.