What am I?

[JHXC]

You are sooo close to it.

I'd say your riddle would be a flag on some sort of city government building thing.

-----------------

Okay cool... uhh... hmmm...
I've given this a bit of thought. Still am very unsure, but a second reading gives me the idea of 'fire' ... ???
Or, if not that, then perhaps 'knowledge' ?
(I have a few other guesses maybe but these two are the most prominent...)
[you don't have to reveal it if I still haven't got it, {unless you want to of course}]

-----------------

As for my own riddle, that's a very close guess, but not quite what I was originally thinking of...
My original riddle had a few extra lines, but I feared that it would become too obvious.

It literally sits on the crest of a dome...
|[ I was thinking of something a little bit less modern]|
|[ something smaller and more ornamental.  It sits on a literal dome, but perhaps a smaller dome than you might think. ]|
(spoiler: click and drag over the lines above to view the text within the brackets)

Ok, looking back at it one of the first answers you gave may have been the right answer, so I'm just going to spoil it here if you need it. If you figure it out on your own, however, you're a genius:
[Time. That is the answer. If you think about it, everything should make sense. "A universal consumable" relates to how everything "consumes" time by basically existing. "Always in motion" is about how time is always in motion (kinda obvious).]
["Always in short supply" is about how people seem to always hurry, because we often have little time to do things in life (also in the grand scope of the universe,a human life is like a drop of water in a vast ocean).]
["Unpredictable" we can't predict the future. "Unstoppable" we can't stop time (kinda the same as always in motion). "Unavoidable" we have to deal with time constantly, and while we may sleep or get knocked out, we can't just not experience time.]
["An omnipotent force, strong enough to grow forests and break the ground," this one is a doozy. Basically, give anything enough time, and it will either be destroyed, made, or completely changed. "Grow forests" means two things. One, it refers to trees taking time to grow and mature. Two, it refers to family trees, where generation after generation takes time to be born, and the family trees grow as a result. "Break the ground" means how the continents (the ground) shift, break, and move over millions of years.]
["The currency of life" all life is on borrowed/bought time. "The carrier of light," I can see how this can be confusing. Idk if time is the only force at play here, but the main reason why light works, and why we see colors and everything, is because of light speed, which is based off of time]
["A magnificent river in which all of existence maneuvers and functions on," this is supposed to refer to the "flow" of time, and how everything either goes with the flow, or takes advantage of the flow to it's advantage.]
Spoilers up above. I think u know what to do.

Even with ur spoiler I'm kinda stumped, but Imma go with a sword in the rock. That's prob wrong tho