Dollhouse

Visit Delv the Toy Soldier in Eos Tower.

You met Olson the Toy Soldier who's standing guard with Delv on 100th Floor of Eos Tower. Olson told you that a monster that came through a Crack in Time ran off after stealing a pendulum from the Ludibrium Clocktower, and disguised itself as a Doll's House in this room. You must find a slightly different Doll's House among all the Houses inside.

Inside the secret room of Eos Tower, I located the monster disguised as a dollhouse, destroyed it, recovered the pendulum, and gave it to Mark the Toy Soldier. This should get the Ludibrium Clocktower to start working again.