"Miss Orland, do you know more detailed information about the 'Gate of Death'?"
Shard asked again, and the witch nodded slightly:
"It is difficult to move that door due to its size and other reasons, but not every condemned criminal can be securely escorted to the execution grounds in the Midland. Hence, the 'Gate of Death' includes a method of opening the door from outside its main body."
This could also be considered Spatial Movement, only that dying once as a price is perhaps a bit too harsh.
"I'm not a member of the Supreme Witches' Council, because the previous members are still there, so for the time being, my teacher is just a substitute. But it is said that one needs to find a place where death and life intersect, and then an official Council member, acting as the executioner, can draw forth the projection of the 'Gate of Death' at the boundary by the power of the Council. The effect after opening the door is completely identical to that of the door's main body."