At the foot of the King
One of the 34 professions of Tikor and perhaps one of the most feared. Are they misunderstood masters of the shadow? Or assassins for the crown?
The exact origin of shadow invocation is still a mystery. Some researchers have said the originators wanted to stay anonymous, not wanting to be associated with the dark art they had created. The most cited rumor is that it was an invocation gone wrong.
A young and inexperienced invoker attempted to channel elements beyond his ability and in a twist of fate tapped into an unknown void. Whether it was by design or accident, someone could successfully and repeatedly invoke from a nameless void, and gain abilities by doing so.Excerpt from World Anvil