Now, maybe a small poem to lead the way ? [Now actually solvable, my bad]

Ahoy Space cats of all horizons!
I found a strange letter by my doorstep this morning, supposedly it'd open the doors of some foreign domains. Ah, who cares?
Puzzles am i right?!
It reads:

Within nebulous haze, the demoness sways,
Her crimson eyes, a glowing blaze.
With predatory grin and voice in swarth,
She lures the lost with whispered warmth.

With nefarious whispers, the demon misled,
Amid covert plots, she shaped his dread.
Her titanic will bound him in chains,
A defiant pawn in dark domains.

He met a queen, auguste and fair,
Yet thwarted dreams obscured his glare.
Through agonized trials, he withstood the fight,
With unshaken alacrity, he reached her height.

By potent will, her curse was slain,
And cupid’s grace broke love’s refrain.
Through iron storms, he carved his fate,
With kryptic strength, defied his state.

In balanced peace, his heart held true,
As modest hands claimed love anew.
With serene joy, his soul took flight,
And fragrant dawn embraced the night.

There was a note too:
Oh, and I should tell you that only the start holds sway, that gold lies within those lines and probably that only duos shapes the way.
Whatever that means.

This gibberish eludes me, perhaps you, space cat, might find the way forward ?

Edit3:
A single word cannot bring more than 118. Undiscovered, and hypothesis do not count.

Edit1:
Oh space travellers, time seems to have an impact on the letter, another line appeared ! It reads:
Fine wine age well = __, Well, I knew that! Nothing too stricking here, oh wait! This seems to be written in a special ink... silver ? Yes, it's silver I'm sure, maybe it matters somehow.

There seem to be more still, but i cannot deciper it from now.
Ah ah! I knew something would show up if I actually waited long enough !

Edit2:
Let's see.. few lines, numbers, uh uh.. does it..?! Oh right, it says:
A teacher broke, his hope ran dry, = 242
Turned to meth as bills ran high. = 204
With cancer's clock, he chose to stray, = 39
And Heisenberg was born that day. = 92
Is it really Heisenberg ? The... german physicist? Although, why cancer then ? I'm not sure anymore; the deeper we go in this letter and the less it makes sence to me, but I'm counting on you to have a better understanding of this gibberish, travellers!

Oh, there's a picture below that, but i can't see it properly yet. Don't worry travellers, I'll find a way if need be!

I tried my hand at a SGTool protection, I hope i did not mess it up. All games are level2+ and the GA runs until the 30/03 3:30pm ( too many 3s).
I got inspired by the many puzzles that appeared recently, thank you SG, you're great!

Edit3:
I sincerely apologize for those of you who got the right number but the lock didn't budge. I failed you all, feline travellers. This should be corrected now, but again, sumimasen 🙏

Oh, and as always, GL space cats! 🍀