So, my palyers bypassed about half of the dungeon at our last gaming session and is gearing up to go fight Kala. THe cleric, a Radiant Servant of Pelor, wants to call a planar ally of some type to help out in the fight.
My plan, since I don't think they need that much help, is to make the summoning fail becuase of the pervasive Abyssal qualities and becuase Kala has place wards around the temple itself to protect it. I was thinking a modron would pop in, say "We're sorry, your call could not be completed at this time. Please try again later," and then pop out. Is this fair to the players? I don't want a TPK on my hands but I also don't want them to walk right through this big, very important fight.
A couple of things to mention-they are currently in a rope trick. Would a summoning work there? If they tried to do it in the mudpool caves, would Kala 'feel' it and send something to stop it?