Blightberry

Moonlit Transformation. During the day, these berries appear no different from a Goodberry. Their movement speed is 0ft., and they cannot take any actions or reactions. Once the moon shines upon these bright red berries, they undergo a blighted transformation. They grow to size Medium, have eight large, spindly legs, and a huge maw splits open at the face of the fruit. 

Natural Healing. The Blightberry, having healing properties coursing through its body, can roll (1d4 + 1) at the start of its turn and heal for that much or spit its juice at an ally within 30ft. as a bonus action and heal them for (1d4 + 1).

Multiattack. The Blightberry can attacks two times using its action: two stomp attacks or a stomp and Blightbite attack. It's Blightbite can only be used once on its turn.

Blightbite. The Blightberry chomps down with its gaping, serrated maw, letting its seedy skin dig into the flesh of its target (+3 to hit). It deals (2d4 + 2) piercing damage on a hit and triggers a Constitution saving throw (DC 14). Should the target of this attack fail the saving throw, a berry branch and berries will begin to sprout from their wound. At the start of an afflicted creature's turn, they take (1d6 + 4) poison damage and may use their action to rip the budding plant out, making an Athletics check. The DC for this action begins at a (DC 15), but for each turn the plant is left to grow, the DC increases by 1.

Stomp. The Blightberry stomps down on a creature with its sharp leg towards a target within melee. (+2 to hit) On a hit, it deals (1d8 + 2) piercing damage and triggers a Strength saving throw (DC 15).Upon failure, the target it knocked prone.

Phloem Web. The Blightberry spews a spray of sticky thread-like material in a 10ft. cone, triggering a Dexterity saving throw for those within it (DC 15). On a failed save, the creature is trapped underneath the web and is Restrained. On the restrained creatures' turn, they can use an action to break themselves out, making a Strength check against the same DC (DC 15). This attack spreads a 10ft. cube of phloem, and this area becomes difficult terrain.