Unseen Crystal

Unseen crystals can be cast with any form of pointed rock. You scatter the stones while whispering the incantation. Once all the stones are invisible, the spell is complete. When one is disturbed, touched or moved, all the stones will fly up and mercilessly attack whoever touched them until all the stones have attacked. Then they fall to the ground and return to their invisible state. Depending on the size of the stone, they each deal one D4 each. Larger stones can also crush the victim, but you must be a level 4 or higher.