Q551A

Phantom Steed creates a quasi-real horse-like creature. It's definitely a creature, for the purposes of, say, an Invisibility spell. But what about something like Deathwatch? Does it read as Alive, Dead, Other (like a construct)? Not at all, since it's only quasi-real and has no actual Life to detect?

551BIt has HP, but no saves listed - does it use the saves of the rider? What if the rider isn't currently riding it?