It would also mean that he would finally be able to sense the true essence of the mystical energy and acquire those dreadful skills the Demon Earls had. Not only that, the rank up from a demon viscount to a demon earl meant that his body would be going through various qualitative changes.
For example, his bloodline. A Demon Earl's bloodline was much purer than a Demon viscount. So when he ranks up, the purity of his demon lineage will be on a whole other level and the effects it would have on his mind would also be on a whole other level.
A demon nobles rank is not only measured by the purity of their bloodline but also the capacity of mystical energy they can hold in their body, the amount of strength they can exert, their mind, skills and the comprehension of the mysteries of mana that they possess.
Everything goes through a qualitative change when a demon noble ranks up. Just by thinking about it, Simon was getting excited.