Oh please someone, combine these. Whether it's fantasy, dub-con, au, it all works.
Depowered Caleb being chased through an extradimensional space by a powerful wizard (and/or that wizard's sophisticated golem toys) And depowered Caleb being caught.
Special spices: Magical teasing, whether it is the environment entrapping him temporarily before letting him go, just for fun Caleb legitimately wanting to prove himself and possibly even outwitting his captor (for a time...) When the Shadowhand (or whoever has created this world) decides they want to visit, the true power of the extra dimension makes itself known. Caleb has zero chance against magical bindings or the iron fast grip of golems and he is thoroughly Dominated.
Shadowgast! or Caleb/a Wizard - Pan's Labyrinth-esque + Collar
Whether it's fantasy, dub-con, au, it all works.
Depowered Caleb being chased through an extradimensional space by a powerful wizard (and/or that wizard's sophisticated golem toys)
And depowered Caleb being caught.
Special spices:
Magical teasing, whether it is the environment entrapping him temporarily before letting him go, just for fun
Caleb legitimately wanting to prove himself and possibly even outwitting his captor (for a time...)
When the Shadowhand (or whoever has created this world) decides they want to visit, the true power of the extra dimension makes itself known. Caleb has zero chance against magical bindings or the iron fast grip of golems and he is thoroughly Dominated.