Justin noticed a crack in the floor of the sarcophagus that had a slight breeze, prompting Senda to test a candlestick on the wall. As he pulled it, the floor slid away revealing a staircase into darkness.
The stairs lead to a small room with two doors. They took the right door and found a room with mushrooms, a desk, a rusty sword, and a tunnel outlined with runes to ward against the undead.
The other door lead to a dead end with several book cases. The crew immediately began pulling on books and found a secret door to the left. Inside they fought an undead being, then found the notes and formulas of Delwyn Rheins.