I'm probably going to start out with the void form since that will take the most work.
What I want to happen is this:
The Illusionist throws out a special bolt, which will create an exit point for the portal, but it isn't active yet.
A portal begins to form at the Illusionist's position, and follows him until it's completion.
When the portal completes, all players (allies can opt out of this by

ing) around the Illusionist are teleported into the Void, a special section created on the map, and both portals are now active for X seconds.
Any player can touch the entrance portal after this to enter the Void willingly.
The Void consists of a small bunch of floating platforms in a sort of twilight, and there are only 3 ways out:
1) Leave via the exit portal (it'll be up to Red team to deny Blue team access to the portal if they don't want to be followed)
2) Jump out of the Void, and kill yourself
3) An illusionist can cast a Void portal again to pull himself, and only himself, out of the Void.
After X seconds both Portals close, leaving anyone in there to decide their own fate.