Fast Healing Evolution and Syntesist.

[Jecht]

My question is, if fast healing evolution works on a eidolon fused with a syntesist and if so how.

1. Both receive benefit, ie. both hit point pools are effected.
2. Both receive benefit, only one hit point pool at a time are effected.
3. Only summoner benefit, Only summoner's hit point pool can be healed this way.
4. No effect.

Also if summoner have selected "share healing" feat from ACG, would it have any influence on the effect.

Thank you for reading and hopefully a response.

[Diego Rossi]

a) Fast Healing (Su): An eidolon's body gains the ability to heal wounds very quickly, giving it fast healing 1.

b) The synthesist gains the eidolon's hit points as temporary hit points. When these hit points reach 0, the eidolon is killed and sent back to its home plane.

Fast healing work on the eidolon. Temporary hit points aren't recovered with fast healing, so 4.

c) Share Healing (Teamwork)
Your link with your companion creature allows you to share with it any healing magic that's cast upon you.

Prerequisite: Ability to acquire an animal companion, an eidolon, a familiar, or a special mount.

Benefit: When you and your companion creature have this feat, your companion creature is adjacent to you or sharing your square, and you receive the benefit of a healing spell (whether from yourself or another source), you can divide the hit points healed evenly between yourself and your companion creature.

Do nothing if the one healed is your companion.

[Jecht]

Fused link:
Starting at 1st level, the synthesist forms a close bond with his eidolon. Whenever the temporary hit points from his eidolon would be reduced to 0, the summoner can, as a free action, sacrifice any number of his own hit points. Each hit point sacrificed this way prevents 1 point of damage done to the eidolon (thus preventing the loss of the summoner’s temporary hit points), preventing the eidolon from being killed and sent back to its home plane.

So a summoner can keep his eidolon at 1 hp while depleting his own hit point pool to keep it summoned. ie. Fast healing would be in effect?

With shared healing as long as the summoner is hurt he can restore the eidolons hit points?

[Melkiador]

http://paizo.com/paizo/faq/v5748nruor1fz#v5748eaic9ob8
Effects that specifically heal the eidolon, restore the temporary hit points.

Edit:except there is a separate entry for fast healing that says it heals the summoner and not the eidolon.

[Jecht]

Thanks Melkiador.

[Snowlilly]

Diego Rossi wrote:

Fast healing work on the eidolon. Temporary hit points aren't recovered with fast healing, so 4.

The issue was addressed by a developer a couple of years ago in the One Synthesist Summoner Thread to Rule Them All thread.

The Synthesist recovers hit points, the eidolon does not recover temporary hit points.