Blood Tentacle

A sanguinary tentacle of blood commanded by your consciousness emerges from an open wound on you or an ally and attacks a creature within range. Make a ranged spell attack against the target. On a hit, the target becomes restrained and poisoned (unless immune) and deals half damage with weapon attacks until the spell ends. The caster or a chosen ally within 10 feet will take 1d8 poison damage to activate the spell. The tentacle also does 3d8 poison damage to the target initially, and 2d8 at the start of each of its turns whilst the spell is active.

At the end of each of the target's turns, it can make a Constitution saving throw against the spell. On a success, the spell ends and the tentacle collapses. At higher levels of casting an additional 1d8 of poison damage is added to the first attack, and additional tentacles can be generated.