A teleporter pyramid should be moved to a character's inventory if left on the ground, with any transition between different maps (where there is a loading screen, and the full party needs to be together).
There is a place on the second map with lots of lava. One of the paths through contains a possible fight with opponents where one can teleport characters into lava to kill them instantly, so with some CC effects or not being able to resurrect the first character quickly enough, that could result in a party wipe.
