A Summon is a broad term for any creature controlled by another creature.
In Alternating Initiative
Summons go last, and alternate between
Player Characters and
NPCs.
Summons also do not get
Dying Stratum Rolls, because they are considered a creature, and are
Dead once their
Vitality reaches 0.
If the Summon is called from another
Plane of Existence, when it reaches 0
Vitality on a non-native
Plane, it re
Turns back to its
Plane usually with 1
Vitality. If the
Summon dies on its native
Plane, it is considered
Dead.
The default amount of Summons a
Caster can control, of any
Summon type, is 3. This can be increased by using the
Feat:
Studies in Summoning.