Editing DjinnTheBinding (section)

===Anchors and Vessels===
A djinn's human body is only a temporary vessel; its true form is a roiling cloud of elemental energy. However, djinn in service to archangels have their spiritual essence bound into an inanimate object called an Anchor (usually an item of jewelry or a container of some sort, although any portable object can be used). This makes it very difficult for the djinn to leave the earthly realm. Regardless of what it's made of, an Anchor can only be destroyed using special rituals or weapons. A djinn cannot free itself from its Anchor, although non-djinn may do so if they know the right method. However, a djinn who persuades someone to free it earns the enmity of its angelic masters.

If a djinn's vessel is killed, it decomposes rapidly into its component elements (peris dissolve into vapor, marids melt into saltwater, ifrits burn to ash, ghuls crumble into dust, and utukku turn to mulch). The djinn's spirit retreats to its Anchor, where it must remain until it can create a new one. This takes one day and 5 Rukh per health level. A djinn can choose to create a weaker vessel if it's in a hurry or low on Rukh. A vessel must have at least the minumum number of health levels per its Size and Stamina, but the djinn does not have to add all of the bonus levels from its Naphsha. Non-human animal vessels can be created, but the Size of the vessel can't exceed the djinn's Naphsha + 4.

Djinn without Anchors (which includes most Shaitan) suffer from certain drawbacks which counterbalance the increased freedom they enjoy. Unanchored djinn suffer a one-die penalty to degeneration rolls, and if their vessel is killed, they're banished from the earthly realm and can't come back unless someone summons them.