This spell is cast on a suit of mettalic (not leather or other materials) armour. The suit wearer if any, or the suit itself if not currently worn, must make a save vs. Spell or burst asunder with the force of a grenade, doing 2d10 points of damage to all creatures within 20' of the suit, with a save for half damage applicable. Magical suits have a save bonus of +2 per plus of the armour, i.e. a suit of Plate +3 would have +6 on the save.