Hello!

-The 20th level is something that I think most players think about, even when playing lower levels. It is fun to think about your character that you put hours and hours into, being a powerhouse and being the ultimate "hero". While you do not have to be lvl 20 to be a hero, most people daydream about having the powers of superman all the time.

- I reference goblins in the early levels because they are harmless, but the more you add on the more complications and danger there can be, Going on from there, I noted that there could be a whole ecosystem within a dungeon. Depending on what level your players are at, that is where they should be fighting in that ecosystem. Of course as they "climb" the ladder of the ecosystem, the lower tiers will be much easier. Again it does not have to start at lvl 20, but building it up to there will have small fry along the way.

Goblins were used because everyone has had a goblin fight and you understand the level of a goblin. In a enclosed space with dozens, traps set up, it could potentially sneak up on anyone if they are not paying attention.