Blood Walk

Starting at 14th level, once per round you can use 15 feet of your movement to step magically into one creature within your reach and emerge from a second creature you can see within 60 feet of the first creature, appearing in an unoccupied space within 5 feet of the second creature. Both creatures must be bigger than you or of equal size. This movement does not provoke Opportunity Attacks.

Entering and exiting a creature is painless unless a blood magus wishes otherwise (see below). In most cases, though, the destination creature finds being the endpoint of a magical portal surprising and quite unsettling.

If he desires, a blood magus can attempt to make a bloody exit from the destination creature. He bursts forth explosively from the creature's body, dealing 10d6 points of damage unless the creature makes a CON save. When he makes a bloody exit, a blood magus must succeed on a DC 15 CON save or be stunned for 1 round

Constructs, elementals, and undead are immune to the effects of Bloodwalk.