I checked the forums and found a couple of posts asking this question, but no official reply. From the PRD for Occult Adventures, the ghost rider cavalier archetype says:
Ghost Mount (Su): At 1st level, a ghost rider gains the ability to manifest a special mount of conjured ectoplasm rather than one of flesh and bone. This spectral companion functions like a spiritualist's phantom companion, using the ghost rider's cavalier level as her effective spiritualist level.
In the spiritualist section describing phantoms, under Ectoplasmic, it says:
Phase Lurch (Su): A phantom in ectoplasmic form has the ability to pass through walls or material obstacles. In order to use this ability, it must begin and end its turn outside whatever wall or obstacle it's moving through. An ectoplasmic phantom can't move through corporeal creatures with this ability, and its movement speed is halved while moving through a wall or obstacle. Any surface it moves through is coated with a thin, silvery mucus that lingers for 1 minute.
I understand from the Occult Adventures FAQ that a future errata will say that phantoms are not allowed to wear armor but still will be allowed to wear other magic items, suggesting that they will be able to hold physical objects while using their stated abilities. So my question is, can the phantom carry its rider through walls or material obstacles using phase lurch? Thank you.
Can they use it with a rider?
Yes. I mean, sure, it'll result in the rider hitting the wall and being knocked off and left behind, but the mount can use it just fine.
Can they use it to phase a rider through a wall?
No. Riders are not magic items.
