Critical Role S01 E44 The Sunken Tomb

"Is it Thursday yet?"

In hopes of defeating the Chroma Conclave, Vox Machina sets out to recover the Vestiges of the Divergence—ancient armor, weapons, and other items of immense power. They learn the location of one Vestige, the Deathwalker's Ward, interred with an ancient Champion of the Raven Queen... at the bottom of a lake.