Could Orrn be a Volcano?
I'm seeing lots of theories about Ornn being a Watcher or a dwarf or an Iceborn. But I think he is a volcano. Let us analyse some of the lyrics:
Dark smoke exhales from the mountain half and wind blows through hollow dells, skies clear as day, shall soon turn gray and you'll know, you're nearing Ornn.
We have a smoking mountain that is blocking out the sky. There is almost certainly a volcano involved.
River of fire, that scorches the earth
Lava.
The Shaping Hand, we know as Ornn.
This is what makes me think Ornn is the volcano rather than someone living in a volcano. Ornn is the Moutainsmith, and the Shaping Hand. He forged the Freljord. Tectonic and volcanic activities play a key part in shaping landscapes.
Sharjo has also said that Ornn is very big, and very hot.
So in summary, I think Ornn is a dormant sentient volcano, related to Malphite, who will shortly wake up and do... something. I know it's no the most convincing theory, but I wanted to put it out here just in case it's true.
EDIT Another bit of evidence I forgot to mention. The second verse of the poem:
But close stands a bridge, frozen by time and across, you'll soon find Ornn.
Orrn is apparently _always _ on the other side of the Howling Abyss. He can't move much if there is a song pinpointing his location. This would make sense if Ornn is a part of the landscape, such as a volcano.
And I apologise for spelling the name wrong in the title.