Summoning

A summoning effect instantly brings a creature or object to a place you designate. When the effect ends or is dispelled, a summoned creature is instantly sent back to where it came from (typically another plane, but not always), but a summoned object is not sent back unless the effect description specifically indicates otherwise. A summoned creature also goes away if it is killed or if its Hit Points drop to 0, but it is not really dead. It takes 24 hours for the creature to reform in the place from which it was summoned, during which time it can’t be summoned again.

When a summoning effect ends and the summoned creature disappears, all spells it has cast expire. A summoned creature cannot use any innate summoning abilities it may have.