The Everlasting said:
What are some of their best feats?
Mortamor was a demon lord who able to conquer and screw up two Earth sized dimensions (The Real Realm and Dream Realm). He has three forms, an old magician form, then a some giant gargoyle form, then this form with a giant demonic head and 2 hands. in the fight he is obliterated in his second form and was sent away deep into space. Just for him to literately pry open space like tearing paper in half to show his third form.
Nokturnus, is kind of like a fusion of Ganondorf and Beerus in character. Basically he once was woken up and was asked by a kingdom to kill Mortamor, he would have been fine with it, but when he saw that the kingdom thought he was some hideous beast and gave him frog-stew and spider-chips. He got angry and caused the entire kingdom to be in an eternal nightmare. You do not see him again.
If you beat Mortamor there will be a bonus dungeon with Nokturnus as the bonus boss, he is insanely tough and if you beat him in under 20 turns, he will have a special ending where he completely godstomps Mortamor. Doing many abilities that do 9999 damage to him and causes him to be obliterated by just his aura. When Mortamor goes to his third form, Nokturnus gets bored and goes all out and does all of the strongest attacks in the franchise at the same time.
Nokturnus is considered to be the strongest being in all of Dragon Quest, he is superior to Orgo Demira, who beat both Numen (Who is god) and the 4 elemental spirits at the same time, Orgo Demira also sealed away a ton of multi-continental landmasses away except a place called Estard. He is also vastly more powerful than Corvus who was at least a life-wiper, and possibly Earth level.
Nokturnus has insanely high stamina, teleportation, a diverse amount of magic, the only magic weakness he has is instant death, and the most powerful spells in the game (Including spells called Pearly Gates, Big Bang, Magic Burst, and Lightning Storm).