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 fire or from a critical hit. On a success, the zombie drops to 1 hit point instead.
Regeneration. At the start of the creature's turn, it may regain five hit points, unless it has taken fire or necrotic damage.
Last Grasp. When this creature reaches zero hit points, it explodes into a mix of grasping roots and vines in a 15-foot radius centered on the blight, withering away after 1 minute. For the duration, that area is difficult terrain for nonplant creatures. In addition, each creature in that area when the plants appear must succeed on a DC 12 Strength saving throw or become restrained. A creature can use its action to make a DC 12 Strength check, freeing itself or another entangled creature within reach on a success.
Claw. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 4 (1d6 + 1) slashing damage.
Bite. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 3 (1d4 + 1) piercing damage.
Description
Undead touched by the Gulthias Tree are strange creatures animated by vines and roots. The horrific symbiotic relationship keeps the bodies alive as the plants feed on the blood from the zombie's victims. More importantly, the greenery regrows, keeping the zombie alive longer than usual.
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