That’s a good question; I had wondered about that myself after recalling how Lloyd referred to him as the “King of Shadows” in season 11. He hasn’t been seen using them since his escape from the Underworld. I would guess that either it was only being in the Underworld that let him use such magic, or that he simply quit using it once he escaped, either because it was impractical or because he had other, better powers at his disposal.