Tom’s ability is rather unusual. I’ve never heard of it being done before…however I suspect the higher ups can do it. I would LOVE to have that power!
I point out that despite what was previously thought, Arch Demons seem to have less than zero difficulty popping back and forth between Astlan and the Abyss.
I am sure, many a wizard will find this quite distressful once they fully realize that no one summoned Exador or Ramses or Bess (whom they don’t yet know about at EOV I)
There has been a general assumption that Arch Demons and Demon Princes require so much energy to manifest on the Planes of Men that local mana sensitive individuals (seers etc in particular) would sense the giant amounts of mana being used and alert people.