Cactus Sentinel

False Appearance. While the cactus sentinel remains motionless, it is nearly indistinguishable from a normal cactus. A successful DC 20 Intelligence (Investigation) check reveals that it is sentient.

Spiny Body. A creature that touches the cactus sentinel or hits it with a melee attack while within 5 feet of it takes 3 (1d6) piercing damage. Any creature who starts its turn grappling the cactus sentinel also takes 3 (1d6) piercing damage.

Multiattack. The cactus sentinel makes two attacks between its slam and its spine fling.

Slam. Melee Weapon Attack: +5 to hit, reach 10 ft., one target. Hit: 10 (2d6 + 3) bludgeoning damage and 3 (1d6) piercing damage.

Spine Fling. Ranged Weapon Attack: +3 to hit, range 40/120 ft., one target. Hit: 11 (3d6 + 1) piercing damage.

Wallop. Melee Weapon Attack: +5 to hit, reach 10 ft., one target. Hit: 13 (3d6 + 3) bludgeoning damage and 3 (1d6) piercing damage and the target is pushed back 10 feet and knocked prone if it is large or smaller.

Spine Shower. Range 30/90 ft. The cactus sentinel fires spines into the air, which rain down in a circular area with a radius of 10 feet. Each creature in the area must make a DC 13 Dexterity saving throw, taking 15 (4d6+1) piercing damage on a failed save, or half as much on a successful one.

Summon Cactus Minions (Recharge 5-6). The cactus sentinel summons 1d4 cactus minions, which appear within 15 feet of the cactus sentinel. The cactus minions have the same statistics as twig blights, but resemble round cactuses, and have the following additional trait: Spiny Body. Any creature who starts its turn grappling the cactus minion takes 2 (1d4) piercing damage.

Vengeful Slam. Whenever a cactus minion dies, the cactus sentinel can use its reaction to move up to half its speed and perform a slam attack.