Part 1
We are epic, we are everywhere.
We hide in shadows, we give you nightmares.We are your nemesis, we are a dynasty.
We cause diseases beyond imagination or dream.We are drones we are drums.
We are darkness and power,
We are the roman emperor.We are legend, we are ashes.
We are public at long last.
Part 2
We are epic, we are everywhere,
We have our classics, it's only fair.We are invincible, it's no illusion,
We are the devil and the demon.We shout our battlecry, hear our legacy.
We are the horror, the sky is our world.
We are as fast as sound as we fly.We climb the volcano, witness our miracle,
We are the sun, we are the archangel.
We are the same, Who are we?
Hint
Most nouns are all related, Part 1 and 2 fit chronogically, a couple of stanzas are metaphors but not a lot of them. Either way to figure out the puzzle you have to find what links all of them. Also, you've very most likely encountered 'we' before without knowing. And check the tags.