What is a immortalmogus[]
As you hear in their name, they are IMMORTAL, they cannot die, they are a lot stronger than you hear them, they can use the power of their mind because they learn powers while they are immortal, so they can use the powers against you if your annoying, if your not your fine, but if you are.. well. YOUR DOOOOOOOMED. Well, not E X A C T L Y immortal, but a lot more resistant that you think.
Behaviour & IQ[]
It can be friendly, agressive and peaceful, but it wont be agressive that easily of a reason.
He is also extremly smart making him one of the smartest among us entities, but no, he ISNT smarter than zhexmogus, the grand ruler. Why are they that smart? Well, its easy: having an big age makes you learn lots of things that maybe you would need in the future.