Eidolons can take many forms, including dragons, plants, demons, angels, or other cuddly and horrific creatures. The summoner, on the other hand, is a pet class that gives players access to a powerful companion creature called an eidolon. They also have a stance called arcane cascade that allows for ongoing damage over time. They rely on a special ability called spell strike, which lets them load a spell into their weapon and unleash its effects on contact.
The magus is a classic “gish” character, Bonner said, skilled in both melee combat and spellcasting - not unlike the Witcher.
Pathfinder Secrets of Magic includes rules for fulus, rectangular paper charms that hold incredible power.