So, in loo loo land, stolas sings an interesting song with interesting lyrics and i will go through them piece by piece to figure out what his plan is

It always seems more quiet in the dark
It always feels so stark
How silence grows under the moon
Constellations gone so soon

So a lot of information here. I think its referring to extermination day. Especially the silence growing under the moon. Heaven is depicted by a full moon in the hazbin pilot

I used to think that I was bold
I used to think love would be fun
Now all my stories have been told
Except for one

I think the story left untold is his final plan. The thing he needs the book for. And speaking of the book, in murder family he said that he only needs the book once a month during the full moons. Now, remember that thing i just said about what the full moon seems to bee in hell?

As the stars start to align
I hope you take it as a sign
That you’ll be okay
Everything will be okay

This one is straight forward. hes reassuring his daughter that when what happens happens, it will be okay.

And if the seven rings collapse
Although the day could be my last
You will be okay
When I’m gone you’ll be okay

The seven rings likely mean the rings of hell. Though the hazbin pilot stated hell had nine rings, allegedly vivziepop retconned it to seven with each ring representing a sin and sinners only being able to be in the pride ring. However i cant find a source for this to confirm so i’ll ignore that particular line. If it is true, thoguh, then the rings collapse might refer to the barrier between rings that keep the sinners in pride. Moving onto the next line though, stolas seems confident that when his plans come to fruition, it will result in his own death.

And when creation goes to die
You can find me in the sky
Upon the last day
And you will be okay

Now this is the most interesting verse to me. When creation goes to die could mean the death of the universe itself but i personally think its referring to god who may or may not even exist if Blitzo’s comment in the helluva boss holds any water. So with that out of the way, what does this song seem to mean, at least in my opinion?

Well i think that stolas is using the book to break the barriers separating the different rings of hell and open a portal to heaven and wage an all out war where he intends to kill god and die in the process. and more importantly, hes reassuring his daughter that when that happens, it will be okay.