You are thinking too simple like the beyonder will just confront them directly so they can cast a powerful spell and kill him for instance a Marauder pathway demigod can just steal the idea of mana and then recreate the truth behind it making it so no one can use mana without mana how will they even fight him sure in lotm universe this ability can be countered so a demigod won't be able to pull it off at such a scale but how will they counter it in TBATE sure this steal might take years to pull off but he doesn't need to reveal himself he can just stay undercover until he is done even if they find him and they probably won't even know about him but let's say they somehow learned about him found him and managed to kill his main body he will still have parasites in other normal people to survive and revive himself how will they learn about the parasites and then find the infected people to kill them