Background for the question: in my campaign, I have a Mummy being controlled by a group that includes an Illusionist. I need to make the Mummy appear as if he is a certain human NPC. I know I could use True Polymorph, but I don’t want to have to have to make the controlling Illusionist that high of a level.
My question: Would the 5th level spell Seeming accomplish what I am trying to do? I do not need the Mummy to speak or really do anything other than sit there and look like a human. The text for the spell says that it changes the targets appearance; would this be adequate or would I need to use True Polymorph?