You can extend your limbs, and even your body, by partitioning yourself into physically unconnected slices or parts. These are connected by low-end arcanowaves, and continue to function and bear weight as if they were still physically connected.
Besides the gross-out effect, this allows you to extend your limbs and reach up to your Magic meters.
While thus extended, you have a hard time coordinating your physical actions, but you also become segmented and disorienting, so that anyone trying to attack you is penalized. Any physical or supernatural action by you or against you suffers an ActionValue penalty equal to your Magic. Stunts using social skills suffer no such penalty.
This is a rare effect, used as a kind of "life insurance" among arcanotechnicians and other non-combattants.