Grave Titan Harvest

From publisher blurb:

Far below the Fields of Petrichor is a vast cavern containing the skeletal remains of a long-dead Sonorous Titan, a whale-like beast that once floated through the skies of a lost age.

Amongst the bones are ravines and grottos home to bizarre creatures and lost treasures that are as beautiful and valuable as they are deadly. Ghostly shapes swim through the air. Glowing mushroom groves hide frightened creatures. And the Titan’s bones sing sadly as an ambitious wizard and his weary hirelings dig for its precious marrow...