Ancient Blighted Oak

False Appearance. While the Ancient Blighted Oak remains motionless, it is indistinguishable from a normal, dead tree.

Hive Mind. The Ancient Blighted Oak shares a hive mentality with other Blighted creatures, acting in unison with nearby Blighted allies.

Blighted Scourge. Natural weapon attacks by the Ancient Blighted Oak can infect creatures with the Blighted Scourge (DC 16 Wisdom save).

Rooted Resilience. When rooted in place, the oak has advantage on saving throws against being pushed or knocked prone.

Multiattack. The Ancient Blighted Oak makes two Root attacks.

Root. Melee Weapon Attack: +10 to hit, reach 20 ft., one target. Hit: 19 (3d8 + 6) bludgeoning damage. If the target is a creature, it is grappled (escape DC 16). The Ancient Blighted Oak can grapple up to four creatures this way.

Branch Slam. Melee Weapon Attack: +10 to hit, reach 15 ft., one target. Hit: 24 (4d8 + 6) bludgeoning damage.

Corrupted Ground (Recharge 5-6). The oak corrupts a 15-foot radius area of ground within 30 feet for 1 minute. The area becomes difficult terrain, and creatures that start their turn in the area must succeed on a DC 16 Constitution saving throw or take 10 (3d6) necrotic damage and advance one stage in the Blighted Scourge.

The Ancient Blighted Oak can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time, and only at the end of another creature’s turn. The oak regains spent legendary actions at the start of its turn.

• Root Strike. The oak makes one Root attack.
• Grasping Vines (Costs 2 Actions). Vines sprout from the ground in a 20-foot radius centered on a point within 30 feet. Each creature in the area must succeed on a DC 16 Strength saving throw or be restrained until the end of its next turn.
• Entangling Ground (Costs 3 Actions). The ground in a 20-foot radius around the oak becomes entangled with blighted roots. Creatures in this area must succeed on a DC 16 Dexterity saving throw or be restrained. The restrained condition lasts until the creature breaks free with a DC 16 Strength check.