The party went in the dungeon the goblin lead to and found a few puzzles all of them related to goblin knowledge and goblin language. With the help of their goblin friend Forb they manage to proceed further and find a library inside the dungeon.
In the library an Elf named Lionel offered an ‘exchange’ of knowledge. However, they quickly realized something was wrong and found the bodies of the adventure duo that tried to brave the dungeon before them.
As they attacked the Elf a second one showed up and both of them turned into dragons made out of thick paper - book wyrms. A smart use of fire made it a quick fight. The party continued on finding a password to open a secret room in the dungeon. At the secret room an automaton was fixing up parts of other automatons - when asked all he could help was that the last room will require a good knowledge of goblin battle tactics.
The party pushed on and opened the last door - before them a large room with an stagnant water pool around the perimeter. As they all enter it - the door closes behind them and a large Iron Golem drops down in the center of the room.
Prepare to roll initiative :).