Great poem, though we might have to give you the moniker 'misanthrope'. This is very powerful, and though the iambic quart tends to be singy-songy - a characteristic of the form - you've handled it very well indeed. The passion comes through clearly. S6L2 is awkward, the iambic inflections unnatural. It stands out like a sore thumb because all the other lines are so spot on. I think that minor thing is the worst that can be said about this write.
Well done!
Alcuin
Instead of "the conquest of all in their path", why not try "to conquer all along their path" or some such? That will get rid of a rather uncomfortably stressed line. Otherwise, I shall simply agree with Alcuin -- I imagine I do know what you mean
The fourth stanza, and the last, stand out as particularly strong -- but there's really not a weak one.
It's funny. Because I was just looking at it and came to that same conclusion, then came here and read your comments.
I agree whole-heartedly - and will change the line.