Glossary

Summons must maintain astral parity with you to remain on the material plane, unless the spell that summons them requires you to concentrate. If a summon leaves your line of sight for more than 1 round, it becomes unsummoned and must be reconjured by whatever means were necessary to conjure it in the first place. This is not the same as if it is slain, however, as some abilities will specify what happens when a summon is slain. For example, if the summon "requires 24 hours rest" to be reconjured when it is slain, then you may immediately reconjure the summon if it becomes unsummoned due to its leaving your line of sight for more than 1 round.

Spell Logic