So, I just started running my player's through "The Inferno Gate", and when they received their new orders from Fex they asked the painfully obvious question. "Why can't Razelago just teleport to your townhouse in Senara to grab the phegmatic talisman and bring it back?" [Also, to themselves "What!? We've killed several good outsiders already! You couldn't have told us you needed their hearts before?"] Fex's real reason is that he wants the PC's out of his hair for as long as possible while he makes his final preparations for the ritual.
I had actually anticipated this and so was ready for Fex/Razelago to handwave the player's question with, "We tried already and the GR has safeguards in place against evil outsiders teleporting into the area." I thought this was reasonable given the GR's knowledge of and proximity to the Gate itself, as well as any paranoia of Thrune attacking through the use of summoned devils. That said, I'd recommend coming up with your own reason as, "Because then the first act of the adventure can't take place," seems insufficient. Other possibilities may include that Razelago is playing his own game in anticipation of Fex's downfall or that Fex wants more on the ground information about Senara since he intends to conquer it himself (though obviously he wouldn't tell the players that).
This is why I hate teleportation.
I open this thread to other instances of glaring workarounds to obstacles within the AP.
