
MrCharisma |

Since summons aren't immune to bleed damage* we can assume they bleed.
There are also abilities that would interact with bones/organs, and again summons aren't inherently immune.
I think when they die they just kind-of disapppear though (with whatever flavour you like - as avr said).
*Summons aren't automatically immune to bleed damage, although certain summoned creatures are. This isn't dependent on being a summoned creature though, so it's irrelevant.

Melkiador |

A summoned creature is identical to a real version of that creature, except where specified otherwise.
I think this was from a sage advice back in 3.x, so not exactly official, but when a summoned creature is killed, it reforms on its plane over a 24 hour period. This is reflected in the summon guardian spirit feat, where you can summon the same creature every time instead of a random one of its type. If it dies, you have to wait 24 hours to summon it again.

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A summoned creature is identical to a real version of that creature, except where specified otherwise.
I think this was from a sage advice back in 3.x, so not exactly official, but when a summoned creature is killed, it reforms on its plane over a 24 hour period. This is reflected in the summon guardian spirit feat, where you can summon the same creature every time instead of a random one of its type. If it dies, you have to wait 24 hours to summon it again.
I like the sound of that feat though I'd probably just apply it to all summoning if I were DMing.

Melkiador |

I may have been oversimplifying when describing the feat. It's rather complicated, but I just wanted to point out its official reference to summoned monsters reforming after 24 hours. As a second example, the slain eidolon reforms after one day, but it's weird in so many ways, that I didn't feel it was a good example.
The guardian spirit feat basically adds a personalized monster to the list of monsters you can summon with the summon monster spells. The guardian can be leveled as you gain new spell levels to stay relatively relevant. It's not a "powerful" combat option, but can offer some nice utility.
It's especially good for clerics, because you can choose a base creature with the right alignment subtypes to work with sacred summons for standard action summoning. And the feat itself lets the guardian last for minutes per level instead of rounds.