I'm trying to design a spell that slowly but surely destroys a target by transforming them into sand. This is what I have so far, but I'm not sure it's built correctly.

RKA: 1d-1; NND (+1), Does Body (+1), Continuous (+1), 1/2 END (+1/4), Gestures (-1/2), Incantations (-1/4), OAF (-1). [16]

Transform: 1D; Partial Effect (+1/2), 1/2 END (+1/4), Continuous (+1), Linked to RKA (-1/2), RSR (-1/2), Gestures (-1/2), Incantations (-1/4), OAF (-1). [11]

Total: 27 point spell.