TrueLordTrueLaw

Because there's nothing supernatural about it, Mark's strength grows very quickly and he's even used to holding back. They explain in the series that Mark fights as if he were on Earth holding back too much or in the comics from issue 27 to 30 Nolan explains that his powers need to be exercised to develop, that Oliver due to his genetic incompatibility his powers will be inferior to a pure Viltrumite or to him and they will kill him for that, and the comment that he's gotten stronger since the beating Nolan gave him. The thing with Conquest you saw the fight Mark exchanged the pulverization of his arm for Conquest's robotic arm and thus Conquest had the advantage, only when Eve unleashed burns almost his entire body does Mark take the advantage and even so she breaks his hand. In their subsequent rematch, Nolan explains it better: Conquest is more of a spectator than an active participant during their fight, enjoying the sensation of tearing Mark to pieces and how he resists, which ironically causes his near-death and then eventual death. There's no adrenaline rush as something special; what's special is Mark himself, being lucky enough to survive those encounters and become stronger. If you want a clearer reference, check out the official Invincible Universe handbook.

Of course, if you're an insect, you don't have adrenaline; vertebrates have epinephrine. An evolved species like the Viltrumites, who have chemical processes identical to humans until they awaken their powers, obviously have adrenaline or an analogous hormone. The adrenaline theory is the most widespread misinformation in the fandom.

THE STRONGEST SYSTEM, the system is the manifestation of your power from your past life to guarantee your ascension to a higher level in your current life.

It's strange that they don't throw shit at him Xiaogang, it's ironic that it's somewhat refreshing. The biggest criticism he receives is that he took the knowledge of others and simplified it, don't they know the scientific method? He took all the limited knowledge he had and used it along with his own hypotheses to create a complete, systematized and well recognized theory for his time, he is the equivalent of Newton of spiritual masters.

edgy

You've confused time dilation with day-night cycles here. The underworld didn't have day-night cycles.

Her mother has a few loose screws, if it were another universe I would understand that becoming a magician makes you weird but in DxD... Mmm in DxD you are already weird before the supernatural.

Ugh, that's a cruel god if they send you there.

It's time to teach reason and morality the old way