Vicious Sacrifice

The user's blood will gush out of their body which soaks into the ground depleting the user's HP by 3/4s, leaving the user unconscious with a 4th level fatigue. Underneath it will solidify into a giant bear trap-like metal contraption that will spring out underneath the target (or targets), in which they must roll a saving throw or they will be crushed by the sharp teeth of the contraption.