Angels (also called Harpies, or simply the Winged People) are a race generally considered legendary in the Hypogeum. It is said they have wings rather than arms, and live in floating cities obscured by the haze of the upper reaches. Which is rather preposterous, isn't it? If humans developed wings, they could never use them to fly. They're too heavy! And floating cities? How would they navigate the narrow archways and passages that connect caverns?
Nevertheless, they are real.
(Spoilers ahead)
Angels are a race of sorcerers. Magic doesn't run in their blood, however. It runs in their feathers. Angel feathers are uniquely adapted to collect and store ambient magic. However, they use this great power rarely. This is because, without it, they would fall out of the sky.
Magic, as everyone knows, is a pervasive gas which tends to collect in liquids or crystals, suspended like the carbonation in a soda. Contrary to this force of suspension, magic is much lighter than air. This is why angels can fly, and why powerful sorcerers are such whimsical assholes: they take themselves lightly.
Because their wings collect magic, frequent flight actually makes it easier to fly, rather than tiring them out. However, an excess of magic in their wings can be rather uncomfortable in daily life (rather like being constantly tugged by your lapels). Since water can easily take up magic, it is easy to wash off, and produces quite potent magic potions. When they are flying, the water condensation on their wings often drops to the ground as droplets, often incorrectly called Angel Tears. When they are at rest, they save these magic potions for a different purpose.
The cities of the angels are diverse. However, contrary to popular belief, they are seldom monolithic structures. But they tend to have this in common: like the angels, they float by magic. Most angelic cities are aggregate structures, with each building or household being held aloft by its own means, and tied to other buildings by ropes. The means by which they hold magic vary: some employ balloons, while others are built around highly thaumiferous plants or minerals. The maintenance of these means is the main use of angel tears among angels themselves.
Rarely, lone angels or solitary clans will build their homes on large aerial darkbeasts. Though this often prevents them from joining a larger angelic city, it is generally agreed to be sick as hell.
The aggregate and modular nature of most angelic cities explains the conundrum of travel. When they wish to enter another great chamber in the hypogeum, they simply lead their buildings through whatever passages are necessary in single file. As well, it is entirely possible for certain buildings to break off and gradually reassemble a city-of-theseus elsewhere.
The extreme concentration of magic in their society obviously makes them targets for ambitious sorcerers and agents of the dragon. This is the reason for their extreme isolationism and nomadic lifestyle.
