Faction Flag

Faction Flags are a category of Banner found in the Dungeon. These are placed by the game to communicate to the players where specific opponents will spawn. There are six types of faction flags: Not all of these will be found in one dungeon; on some occasions dungeons have been shown to have only three or four types, and as a result may only spawn two sets of monsters instead of all three.
 * Necromantic Sign
 * Marching Bones Banner
 * Molten Legion Flag
 * Diabolic Sigil
 * Ragged Brotherhood Sigil
 * Rusted Company Standard

The spawns themselves are controlled by the walls of the dungeon, not the flags. For instance, standard brick walls will spawn Necromancers and Blue Armored Bones, while slab brick walls will spawn Ragged Casters and Rusty Armored Bones.