hero skill Ethereal Jaunt.

using 1 skill point As a bonus action, the hero can magically shift from the Material Plane to a mystery Plane or vice versa. you can only be on the other plane for 1 minute. 

cursed series- cause one of your fallen foes to come out of the ethereal plane to aid you for a minute or until they run out of hit points. the person comes out at the level they died at and the spirit must be willing to do so. the spirit is silent and will only attack once there is no enemy in sight they will go back. summoning the spirit will cost the hero to take damage equal to their hit dice plus constitution modifier. and the hero will feel the same pain as spirit did when they died.