Corpselite spikes

You place corpselite crystal in the bag of caltrops which is the placed in an open cavity on the corpse and speak the activation phrase, the spell can now be triggered, the Corpselite crystals will take the shape of the caltrops doing 1d6 damage, which scales with the CR of the creature the crystals are planted in. The challenge rating scales with the level the spell is cast at up to a max of 5d6 at 5th level. Multiple of this spell can be cast at a time and you can make the spell lay dormant for certain creatures or people.