Adult Muscle Vine

False Appearance. While the muscle vine remains motionless, it is indistinguishable from an ordinary pile of rocks and plants..

Sunlight Absorption: Whenever the muscle vine is subjected to radiant damage, it takes no damage and regains a number of Hit Points equal to the radiant damage dealt.

Grasping vines. The muscle vine can have up to four vinesat a time. Each tendril can be attacked (AC 12; 25 hit points; immunity to poison and psychic damage, vulnerability to necrotic and slashing damage). Destroying a vine deals no damage to the muscle vine, which can extrude a replacement tendril on its next turn. 

 Planting youngling. When the adult muscle vine is reduced to 0 hit points it can no longer retain its form but doesn't fully die but instead it reverts to a Young Muscle Vine with full hit points. If the Adult Muscle vine takes fire or necrotic damage, this trait doesn't function at the start of the muscle vines next turn.

Multiattack. The Muscle Vine makes two slam attacks or two grasping vine attacks.

Slam. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 20 (3d8 + 7) bludgeoning damage.

Grasping vine. One creature within 10ft of the muscle vine must succeed in a DC 17 Strength or dexterity saving throw or be grappled . Until this grapple ends the creature is restrained. The Muscle vine can grapple one creature per Grasping Vine it has. At the start of a grappled creatures turn it takes 1d10+7 bludgeoning damage. A grappled creature can use its action to make a DC17 strength save to escape the grapple.

Rock. Ranged Weapon Attack: +10 to hit, reach 60/240 ft., one target. Hit: (4d10 + 7) bludgeoning damage.