Now before getting to the present and ending this half-assed backstory, it's time for…
Professor Simon's ultimate skill explanation
Mnemosyne allows access to history to retrace information and actions. It doesn't matter if it doesn't exist in the present, if it did exist from before then Mnemosyne can use it.
Mnemosyne can also allow the user to hide within the gaps of spacetime and project scenes from the past and materialise them into the real world.
Basically, if something exist within the past, it can be used with Mnemosyne.
Hanged man is another parallel to Mammon but instead of dominating a targets desires, it instead stimulates the targets degenerate impulses and causes them to go insane.
This sub-skill, control impulse, also causes you to quite literally tear yourself apart both physically and spiritually. You'd have to be a spiritual or divine lifeform that can perfectly control their own bodies to resist the effects of this skill.
The second sub-skill is soul consumption that is the same as from beelzebuth but since it doesn't have any sort of storage, the consumed soul instantly becomes nourishment for the users soul.
The last sub-skill is soulless resurrection that mutates a corpse into a mindless amphoreus blob of flesh that only seeks to destroy everything around it… with all of its skills it had before death.
And that concludes…
Professor Simon's ultimate skill explanation
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"See Isaac, I told you he knew all along." Evelyn said to the frustrated Isaac.
"I still wanted to see if he actually knew… wait, you knew that he knew the whole time?"
"I said before, he was the one who reincarnated us in the first place."
"Wait wait wait, what is going on here?!" Velzard felt like her brain was splitting open from the sudden revelations going around.
I knew that I had to explain to Velzard what was happening, "Velzard meet my mother, now reincarnated. 150 years ago, when I left them, I tethered their souls to mine and tethered their worlds time to the cardinal worlds. After they died in their previous life, I set in motion for my past self to reincarnate them at a certain moment."
After that Isaac left the room in a sort of hurry.
I looked at Evelyn with surprise, " What's his problem?"
Evelyn was a little apprehensive about Isaac from the beginning but didn't expect him to be like this from the get go, " Isaac isn't exactly happy with you at the moment."
" Yeah I figured." I stepped out of the room and followed him, leaving Velzard to deal with Evelyn alone which she knew I did on purpose.
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I opened the door to the room that Isaac walked into and found it was a bedroom combined with a study, " Woah, this is quite the interesting place, you seem to really like research, you really do deserve the Winters name."
But Isaac seemed exasperated, " Is that really how you wanna start the conversation with?"
" Fine then. Hello Jason, how are you doing?" I said in a welcoming tone.
" It's Isaac now."
…
" Really, no Hello Simon or how are you doing Simon? Why are you so bitter with me?"
Isaac sighed, " I don't know anymore. I guess there are a couple small reasons that just got out of hand."
" Well why don't you tell them to me?" I suggested to Isaac.
"… Why did you never come back?" Isaac asked, his voice tinged with both sadness and anger.
My mind went blank, 'How the hell can I tell him I never intended to go back?' I was at a loss on how to tell him.
" Don't bother, I know why you didn't come back. I'm aware that I'm being irrational right now but I've been bottling all of this out for awhile."
Isaac's words gave me an idea.
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I had taken Isaac to an open field and threw a sword at his feet.
Isaac picked up the sword in confusion, " What is this for, you expect me to fight you? Please Simon, I'm not gonn- AH!" Isaac's instincts screamed at him before he could finish and without warning, a sword flew at him which he blocked and was sent flying.
" I'm not giving you a choice here Isaac. This is the best way to let out your frustration, either you accept this duel… or die."
" Fine then, let's just do this." And with that Isaac agreed to my challenge.
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Our fight was primarily the sword, we didn't use our skill nor magic but we did push our physical bodies to our limits… although they technically weren't physical.
Although they couldn't get hurt with normal attacks like this, both me and Isaac had gotten into it, both letting out our emotions to the fullest.
At some point, our magic power had seeped out of our bodies and began coating our weapons in magic. Our clash now became so volatile that nearby mountains began to break apart.
And out weapons instantly broke. Isaac who had gotten too much into immediately went to his fists.
Caught off guard, I was punched to the ground, creating a crater in the earth. Isaac didn't stop there, he jumped into the hole and kept on pummeling my face in.
"Why did you just leave! Why did you never come back! Why did you just bring me and Mom into this world without any help! Just WHY!!!?" And with that, Isaac slammed his fist down into one final punch.
With that final punch, Isaac stopped his onslaught and with his heaving breath, I knew that he had clearly let it all out. With that confirmation, all my injuries disappeared, "Are you good now?"
"Yeah." Isaac walked closer and layed down in the destroyed ground next to me, both of us just looking at the dawning orange sky. We hadn't evens realized that our fight had lasted the entire day.
Isaac: "Simon, did you ever think of us after you left?"
Simon: " If I'm being honest, I did but not for the reasons that you think it is. What was probably almost a century between two lives, was about a couple days for me, that's time travel for you buddy. I'm sorry if that wasn't the answer you wanted."
Isaac: " It isn't but it does give me a new perspective on the issue. Thank you Simon."
I got up and I reached my hand down to Isaac, "Let's go back home Isaac."
Isaac grabbed my hand and pulled himself up, "I'll race you there." And with that Isaac immediately began running.
"Cheeky bastard." I immediately followed up.
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"How the hell did you get here first, I had a massive headstart?" Isaac complained as we had entered the Rosenthal mansion where we found Evelyn and Velzard baking.
"Did you two boys sort out your issues." Evelyn asked.
Both of us shouted at the same time, "Yes mom!" Both me and Isaac just looked at each other from the realization that due to some sort of time fuckery, we were now technically brothers.