Nia nods, and incants a spell in a droning chant; an invocation to the loa and small gods of earth, wind and sea. Kelp and seaweed grow in sudden bursts through cracks in the cave walls and floor. It comes snapping from pools and lashing across the dim cavern, ensnaring and entangling the beasts caught within the sudden assault!
(Entangle, centered a bit back so that the creatures closest to us are on its far forward edge...allowing us to engage them in melee without having to go through difficult terrain - DC 14 dexterity save or be restrained. Str or Dex check vs same DC to escape, as action on their turns if they are restrained. Difficult terrain in a 20 radius from the center for duration regardless.)