Enemies

Enemies come in the form of less dangerous foes encountered in many rooms, mini-bosses, and bosses. Some enemies are unique to certain floors, but many can be found on several. Mini-bosses are often able to be found on two different floors, while bosses are unique to the location in which they are encountered.

There are five sub-types that enemies are categorized into: Undead, Machines, Mages, Constructs, and Creatures.

Each enemy also has a bestiary entry available on the bulletin board in the hub.

Red bullets
Some enemies fire red and black bullets that deal 2 HP of damage. These are separate from blood bullets, like those fired by swarm Hosts

Frost/Cold Bullets
Some enemies, especially those found only in Maintenance System, fire blue bullets that slow the player if they are hit. The upgrade Weatherproof will prevent the slowing effect, but not the normal damage.

Halos
Rarely, an enemy will have a colored halo behind them. Enemies seen wearing halos will gain an additional power based on its color. Interestingly, halos be attached to an Aegis
 * Red: Makes the enemy effected act like a Malice engine, emitting an area in which enemies release bullets on death, including the halo enemy.
 * Orange: Makes the enemy fire 3-4 shots independent of it's normal patterns.
 * Green: Pulls the player towards the halo
 * Blue: Spawns several swarmers (see beasts section) upon the death of the halo's bearer. Cannot affect swarmers, unlike other halos

Aegis
Some rooms contain enemies equipped with an aegis, a reflective shield that slowly lines up with the player. If the player shoots the aegis, small bullets will be fired back (regardless of what bullet type was initially fired). Aegis are indestructible, so players will need to work their way behind them in order to shoot the enemy that they protect.

In harder areas such as secret rooms, danger rooms, breaches ??? (Unknown), Nowhere, and The Temple some are upgraded to reflect bullets into homing purple stars. These upgraded aegis are more orange than normal ones and are known as eternal aegis.

Hard Mode
Enemies attacks and behavior change based on the player's chosen difficulty.

Normal mode is the default, so enemy descriptions and behavior are based on their Normal variants unless otherwise specified.