After listening to How to Defeat a Demon King in 10 Easy Steps (a total riff on Zelda) I was inspired by the highly colorful 'demon generals' employed by the Demon King and thus, this list was created. All of these individuals should be workable for powerful sub-bosses or even full on boss fights themselves.

An arcanotech weapon system, also known as an implosion bomb, a Schwartzchild, or a Corrosion Warhead

You can't tell safe water from bad, well unless there is a pile of rotting bones in it with not a scrap of flesh left on 'em and then it's pretty obvious.

PVT. Quinn, memoirs

Seven ways to limit potion abuse, or preventing players from shotgunning three gallons of potions before a fight

Not a racially segregated hospital, but rather the Private Medical Complex

There are certain things that need not be said, and events best left in the past, to be forgotten. Be careful what you wish for.

The Circle of Pharisrak has existed for centuries, it's assassins are considered to be untouchable. Not one has every been seen, let alone sent to justice.

I would be willing, yes glad, to see a battle every day during my life.
George Armstrong Custer

In settings where there are long established underworld thief, criminal and otherwise ne'er do wells there is going to be a system of heraldry associated with those who live in and rule from the shadows.

It is a common conceit that banks, loans, investment and other features of the banking and financial system are entirely modern. This is far from the truth, as long as there has been money, there have been people who profitted from holding it and manipulating it.

A collection of space habitats, space stations, space colonies, and anything else artificial that serves as a home to humans in SPAAAAAAAAAAAAAACE!

Lithe as a willow and just as flexible

Inspired some years ago for a Kult/CoC Halloween game

Worse than those of the Shattered Orb are those who have fallen from the Bright Path and Axtrami's grace. Yet among them are some who have recieved the extreme blessing of Axtrami, to become glass themselves...

a cooking system for the DungeonVerse

A legendary weapon of the Ouzquin Dremorix

Hearthstones are actually the main part of a fireplace, but in this context, it is a magical item that is made into the focal point of a house for the DungeonVerse

The focus of discontent between Vandergraff and Powlgraff, the Cathedral was built of ambition and rose marble.