Along the way they made contact with a free spirit who lives in the preserve. He explained that there was a small group of free spirits living there, who had been trying to keep the corrupted area contained, but that one of their warriors had been tainted and bound by the shaman. (Via the corruption metamagic) The team was supposed to meet up with the leader of the free spirits to discuss what should be done about the corrupted spirit, but the drek hit the fan early and the group ended up rushing into the final boss encounter without accepting the side quest first.
So now, I've got a run planned where the team is going to be hired by the chief of this tribe of free warrior spirits (a great form spirit with the astral gateway power) to venture into the metaplanes and attempt to find and purify their corrupted brother. I want to try and make this more than just "woo, we're in a forest" and actually make the run feel like they're in a mystical realm where the normal rules and logic do not apply, so I'm looking for ideas on how to make the place feel properly alien and spiritual--bonus points if it captures the flavor of Native American myths.
I'm also open to ideas on what particular brand of macguffin should be used to "cleanse" the corrupted spirit. IIRC there's technically no counterpart to the corruption metamagic that would allow a normal caster to purify a toxic spirit, and although it would be easy to houserule one in I doubt anybody in my group is going to be thrilled at the notion of having to spend their karma initiating and taking a metamagic with such narrow utility just so they can do the job. I'm thinking maybe a ritual or some kind of focus?
Another potential issue is what to do about gear and non-awakened party members. The current team consists of a fox shifter adept, a materialization Voodoo mage, a Qabbalisitic possession mage, a bioware adept with 7 edge, and a cybered street sam/face with the latent awakening quality. (Hacking/Rigging is handled by an NPC, to help avoid minigame syndrome.) I was thinking this run would be a good opportunity to have the face character's latent awakening kick in, but in the mean time he'll be the odd mundane out, and looking at the rules for astral rifts they technically wouldn't be able to use any of their gear unless I handwave some kind of "you go there physically with all your stuff" shenanigans that completely ignores how the metaplanes are supposed to work.
Anyway, I'm still very early in the planning stages for this, so any input or ideas would be appreciated.
[edit]
Just to give a bit more info, the toxic shaman is still alive and currently in the custody of the Draco Foundation. (Yes, they pulled that off. Got paid the full 1,000,000

