[quote=@Medjedovic]
You can start with only one monster to summon. If it takes too much damage in combat you will feel exhausted and wouldn't be able to summon it again soon. The beast shares attribute with you. As you grow more powerful you can either improve the monster you already have or gain more monsters. 
[/quote]

Is it possible to start with the ability to summon two weaker than average monsters to summon? I had an idea for a character who has two familiars that act as scouts more than actual summons to face in combat.