Blightflower

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.

Slam. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 3 (1d4 + 1) bludgeoning damage.

Regeneration. The thorny regains 5 hit points at the start of its turn. If it takes cold, fire, or necrotic damage, this trait doesn’t function at the start of the thorny’s next turn. The thorny dies only if it starts its turn with 0 hit points and doesn’t regenerate.

Breathe of the Planter. Melee Weapon Attack: +3 to hit, reach 5 ft., one creature. Hit: 3 (1d4 + 1) poison damage, and the target must succeed on a DC 11 Constitution saving throw against suffering magical exhaustion.  It must repeat the saving throw at the end of its next turn. On a success, the effect ends and the target is immune for 24 hours. On a failure, the creature suffers exhaustion until it has long rested.