
HalcyonDaze |
I'm pretty sure you summon the eidolon the same way with a synthesist as with a regular summoner. It's a 1 minute ritual that summons it with the same HP it had when it was dismissed. If it's killed, it comes back at 1/2 HP when summoned the next day and you have to cast Rejuvenate Eidolon to bring it back to full health.
Absolutely. The question here is whether the fused summoner taking taking damage that reduces the granted pool of temporary HP also simultaneously reduce that actual Hit Points of the outsider entity, which is what determines how many Temporary Hit Points are granted at the time of summoning/fusion. If the Outsider never takes actual HP damage until the moment that the "kill condition" of the Summoner's Temp Hit Point pool reaching Zero, then dismissing and re-summoning the Eidolon would reset the Temporary Hit Point Pool before any event happens that would affect the actual Outsider's HP.
The misconception that the Eidolon's Hp counting as temp hp for the player means that its Hp is temporary with respect to itself. This isn't the case.
When the eidolon takes damage, its hp is reduced. Since the player gets to add the eidolon's current Hp as temp hp for itself, its temp hp goes down.
Sorry, but I'm not sure I understand what you are trying to say here. I dont think the Outsider itself gets Temporary hit points or anything, it's just that by my read the Ousider's actual HP dont actually ever take damage unless and until something otherwise unrelated happens, specifically that the Summoner uses up the Temporary Hit Points it grants when it is summoned, which then triggers a banishment and is sent back to it's home plane. At that point it would come back at half-HP so it would only be able to grant half the normal amount of HP.