Your magic allows you to reach into the realms beyond, pulling spirits to aid you for a time. Various creatures of elemental, celestial, and demonic nature have forged bonds with you and will aid you in many ways.
Experience: You gain summoning experience if you had fulfilled the requests or demands of an extraplanar creature.
Complications: Your summoned creature lashes out against you or your allies.
The bond across realms keeping your summoned creature here suddenly weakens and breaks, sending the creature back to its native plane.
Additional Rules: You can hold a number of true names of extraplanar creatures at a time in your mind equal to your Summoning level, and you can forget names at any time.
You can only have one creature summoned at a time via the Summon Creature spell. When a summoned creature makes an action involving a roll, use your Summoning level as the skill. A summoned creature has health equal to the level of your Summoning skill.