the light around you begins to act as if reflected towards you finger tip. a thin beam of light springs from your finger to a length of your choosing up to 5ft you may change this length at any time. 

you may use the beam to cut objects at a rate of 2 inches per second (IPS) with metal, 2 IPS with flesh, and 3 IPS with wood 

you can use the beam to engrave objects by keeping the beam to short to cut through them at a rate of 5 IPS in meatal, 6 IPS with flesh, and 7 IPS with wood