|Expected lifespan||From 10 to 500+|
Demons are sometimes defined as any creature from another dimension, but here it specifically refers to a creature from the dimension of Demonia.
Most demons only speak the language of Demonia, so it would be very useful for the summoner to learn this language or acquire an interpreter.
The large variations in demons makes it impossible to list specific physical, social or mental descriptions.
Most demons come with some special ability (GM's discretion).