Dungeons/Void/Brainstorming

Dungeon

 * Only small areas occupied by a player are visible/tactile; the rest of the surroundings are empty darkness.
 * For the most part, the areas are static; a feature which disappears as a player moves away will return when they next encounter it.
 * Areas occupied by NPCs/monsters: [TBD]
 * Thrown objects (arrows, pebbles, spell energy, etc.): [TBD]

Puzzles

 * Shifting features/areas, similar to dimensional folding (but not what's technically happening, that's Simul's biz)