From publisher blurb: You are not alone. Within you is another soul, another Spirit. It is a Guardian that watches over you, gives you strength, and keeps you company. Guardians Within is a mod for the Sigil System that deals with summoners and spirits, from becoming possessed by these aetheric creatures, to summoning them as grand displays of supernatural power, to seeing the world through unnatural eyes. Unfortunately, not everything in life is free, as gaining a Guardian Spirit as a life-long companion does not come cheap. You have two choices: become a Keeper and accept the Guardian Spirit into your body, or be a Shepherd and let the Spirit live in your mind. Keepers are immensely powerful beings, using the Guardian Spirit's aetheric connections to alter the natural landscape around them, boost their own skills and abilities, heal themselves and even visit the aether itself. But the price they pay for this is the changes to their bodies. The more a Keeper uses his Spirit powers, the more mutations he gains until by the end of his life he looks like (and often becomes) a Guardian Spirit himself. On the other hand are the Shepherds, who suffer no outwardly problems as the Spirit lives in their psyches. This brings other problems, however. Each time they summon their Guardian to aid them in the real world, they lose memories to fuel the aetheric energies within the Spirit. They have been given the greatest power imaginable by being able to summon a veritable force of nature to do their bidding, yet slowly but surely they lose who they are. Eventually all Shepherds lose their entire memories and everything that makes them who they are. They become the vehicles and tools of their Guardian Spirits, meat puppet to ferry around the aetheric overlord inside. Choose wisely who you will become. Each will give you the power of the aether itself, but both will take from you everything. Since Guardians Within is a mod (or addon) for the Sigil System, you will need the Sigil System in order to use it. It is also setting-neutral so you can use it for any setting or genre that you can think of. Inside the mod: Rules for playing as a Spirit Caller, a character who has bound a Guardian Spirit to his soul In depth look at how offering your body to a Spirit as a Keeper will mutate it in 100 different ways to become something otherwordly Rules for summoning and playing as a powerful aetheric Spirit, and using its mighty Quickenings to turn the tide of battle Character creation section for starting your campaign off as a Spirit Caller