In a separate (admittedly non-PFS) thread (titled Occult Adventure Spiritualist and Phantom), someone stated,
On page 77 there is a chart. This chart shows you EXACTLY how many hit dice your phantom has at each level. For PFS play the phantom gets max HP (so 10) plus con at level 1, then half (averaged at 5 or 6 alternating) of the maximum for each additional HD. It's hit dice have a 15 HD cap at level 19, or 15d10+con.
(Emphasis mine)
I have found nothing to support this, but the thread continued and nobody refuted the claim. I figured phantoms would get 1\2 HD for HP (5 + Con mod) at all levels, including first, but if I'm wrong, this makes a big difference. Will someone please clarify?
Thanks!
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Rule for animal companion
There is absolutely no reason to treat phantoms differently. They are not PCs so do not benefit from maximum HP at first level.
They therefore are treated as monsters (average HP at every level).
Edit: further rules
hp: The creature's hit points, followed by its Hit Dice (including modifiers from Constitution, favored class levels, creature type modifiers, and the Toughness feat). Creatures with PC class levels receive maximum hit points for their first HD, but all other HD rolls are assumed to be average. Fast healing and regeneration values, if any, follow the creature's HD
Since Phantoms are essentially eidolons, presumably the rules used for them would apply as well... average hps for each die, including first.