In Dungeons and Dragons
the physical body of an deity, this body is mortal and can be destroyed with a widespread efect of mass destruction. the death of an avatar will not kill the deity controling it, due to the fact that the greater deitys normaly have and control about 5 to 20 avatars at one point in time. though the death of an avatar can weaken a deity.
Deitys have supreme power, but are unable to escape the chains of their immortality.
an avatar or avatara is an incarnation of an immortal being or an ultimate supreme being (i.e. a god or goddess). avatars or avataras are said to descend to earth in times of great evil or unrightousness.
it is said that the avatar came over a thousand years ago to save earth.