Blood Swarm (5e Spell)
From D&D Wiki
|Casting time:||1 action|
|Components:||V, S, M (a bloodbloater in a sealed container, which the spell consumes)|
|Duration:||Concentration, up to 1 minute|
As the contained bloodbloater explodes, four swarms of bloodbloaters begin emerging from the ground in unoccupied spaces within range. They are charmed by you, so long as you are concentrating on the spell, and disappear after a minute.
Additionally, whenever a swarm deals damage with its Bites action, you regain hit points equal to half the damage dealt.
At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, you summon two additional swarms for every level above 3rd.