Temple of the Necromancer Lord

Publisher's blurb:

A shattered red crystal heart glows from where it lies on cold stone, pinned down by chains held by angelic statues. Larger-than-life faces, carved out of the walls, weep rivers of a shining crimson substance that flows into the scorched fjord beyond the entrance. Steep soot-stained rocks are bare and stripped of life.
Two towers stand watch on each side of the entrance, alongside large stone steps leading inside the temple. Metal grids join stone platforms, connecting to cells filled with skeletons ready to awaken for their master.