Summoning is definitely not a Dungeon magic; it's quite weak for them, and even worse with Light... And you don't need to search for it... On almost all new maps, there's a library so that players can experience the new features.
P.S. On some map, there's a sphinx nearby, and here's a hint (if it's not fair, I apologize): right behind the garrison (from the red player's positions when going through the portal), you can dig up an Asylum. It was there three times in a row for me.
God save us everyone
Will we burn inside the fires of a thousand suns...