Sleep though this

[starlight]

Keys jangle at the precipice of fate
Instinctive virtues endeavour to raise their heads
The gloamings mist winds through the straight I think the use of gloaming obscures meaning. Twilight means the same thing and doesn't detract in my opinion
And those virtues turn their eyes back to their beds. "back to bed" could shorten this

So tired
 
We are lost in our keep
Though all built this mighty edifice
Too many are prone to seductive sleep
The eagle has leapt in petulance Why in petulance?
and flown too far.

So tired
 
We are many, we are few, we are one What does this have to do with the poem?
 
The oldest lion has accepted its limitations
Its mind slides though satin into thorn, thorn to shadow.
A bush may burn but only in failing machinations
His pride now has none.

So very tired.
 
He was many, he was few, he is one
 
The stars wheel as the wind bites from the east
And while the cold tears at our hearts and minds
We throw the treats of our children to the beast
It devours what we give it, it destroys what it finds. I like this stanza a lot

It doesn’t sleep. I think you could end here nicely
 
None are any, all are few, I was one. Again, I don't really understand what this adds/how it fits in

This is a really nice poem. I think sometimes your verbiage obscures the meaning. I also think you need more of a focus. It's super abstract and I don't really understand your point in a lot of places. That said, the phrasing is really beautiful at times. You have a great base on your hands.