Leshies are immortal nature spirits, often found within Lamannian manifest zones. They usually lack a physical form, but druids and other primal practitioners can create bodies for them, which they then inhabit. Typically, the druid will create a suitable body from plant matter, and a spirit will choose to inhabit it.
There is a community of leshies living around Vaanka Dar in the Demon Wastes, native to the manifest zone that surrounds the fortress and befriended by the druids of the clan.