Twenty One Pilots: Every Trench reference to fire (the sun, light, etc.)

Hey Clique and whoever else happens to be reading this,
I'm The Noah. This is Noahbody Cares, the blog that critics are saying is a blog...

I really love Twenty One Pilots. The way Tyler Joseph and Josh Dun write lyrics that are 49% highly complex imagery 49% confusing metaphors and 2% glorious puns while still being catchy enough to play on Pop-Radio blows my mind.
A lot of the visual metaphors in Twenty One Pilots last two albums have been about fire (or heat or light) so I just wanted to talk about that. I wanted to figure out if the Sun, Fire, Heat represent something consistent across all of Twenty One Pilots recent music.

Fire for reference