General

Ahh I see what they drop now. Now for a level 107, where can he go to farm for these mobs and bosses? I hear its supposed to be 20 levels above or 10 below so it can technically be anywhere they spawn those monsters, correct me if I'm wrong.

Killing normal mobs spawns elite mobs.
Killing elite mobs spawns elite bosses.

Starting from a raw map, it takes about 30+ elite mobs to spawn an elite boss. But there's an indicator that the elite boss will spawn within 5 elite mob kills. When an elite mob dies and it says "You feel something in the dark..." the elite boss will spawn after a few more elite mobs.

With that said, it's best to change channels every time an elite mob dies and it doesn't say "You feel something in the dark..."

To farm for an elite boss you usually have to go to a popular hunting ground such as Red Golems or Drakes. It's recommended to hunt with others and a kanna to increase spawn rate. Furthermore, people cannot spawn elite mobs or bosses if they are not at most 10 levels above the mobs or 20 levels below them, so don't let high levels ks you.

epic pot scrolls, protection scrolls, clean slates, chaos scrolls, etc.

I see... but what exactly do these guys drop that's so expensive?

The elite boss thing IS the most profitable. At about 1.5b a day if you're lucky and 2+ if you're luckier. Oh my god so lucky.
You've come back at just the right time to get on the train. You grind on a map. Any map with a monster within level range. So 20 levels above you or 10 levels under you.
Now if you see it says something with the word grim on it you move to another channel cause ain't nobody got time for that.
If it says dark you stay and keep killing. And kill and kill.
Or you can do what all the cool self respecting degnerates..I mean kids do these days and hang around drakes hunting ground 2.
Anyways you see that bonus stage that came after it? Get the YELLOW ones. The YELLOW. They're YELLOW. You can't miss them because they're YELLOW with purple stuff on the inside.

Profit endlessly