The Mad Sculptor

In the infamous Apocalypse Megadungeon there is a door cast in bronze depicting the fall and incarceration of the goddess Asundra, a master work so fine that more than one scholar has braved the dungeon (with proper escort) just for a look at it. Beyond lays the workshop of the mad sculptor. His genius transcends the boundary twixt art and thaumaturgy, producing effect indistinguishable from magic. Monsters, relics, and unfortunate adventurers have all found themselves unwilling components of his twisted works. What is the mystery behind the mad sculptor?