The Dark One

The Dark One is a boss that is fought in the final room of The Darkness whose main gimmick is accumulating darkness enemies to limit the space of the boss arena.

Appearance
The Dark One is completely black in body color. It wears a dominus and has bat wings on its back.

Behavior
The Dark One will chase the nearest player at. Every 10 seconds, it will summon other darkness enemies except The Fallen and The Corporeal, limiting the space inside the arena even more. Alongside The Shadow, it will iterate between summoning The Phantom and The Corrupted, and speeds up the summoned Shadows with each summon. It can only summon 10 before stopping.

Any Shadows that were teleported inside the boss fight will not accelerate.

Tips

 * Kill The Dark One as fast as you can, otherwise his spawned Shadows will slowly accelerate in speed and eventually outrun you, ending your run.
 * It is recommended that only one player with the highest battles The Dark One.
 * If you're in solo, you should atleast have (recommended ) so you don't die to The Corrupteds that spawn.
 * If you have, make large and smooth turns around the room to prevent The Dark One from catching up. Although you'll still likely die from the Corrupteds if you're in solo.
 * Get other party members to stay in corners together, and work together to fight off any summons that come their way.
 * You should catch the aggression of all of The Dark One's spawns immediately, as not doing so will set them up to cut you off when you circle back around. They will naturally cluster and get hit while you are fighting the boss.
 * As the boss is weak to, it is recommended to use a sword with that element. However, these swords do not appear until later in the game.
 * Items that can kill every enemy in a room should be used if The Shadows are catching up. This is the only way to survive them.
 * It is recommended to warp back a few worlds in order to decrease The Dark One's scaled, making him much easier to fight.
 * If you obtained a Flashlight, use it against The Dark One as it can instantly kill it.
 * If the player has around and a Dicey Blade in world 4-5, they can do a darkness run relatively easily.
 * During the ruleset in crown challenges, the player should obtain a Katana in order to outspeed every enemy.

Trivia

 * The Dark One was the first boss added into the game.
 * Prior to v1.6, The Dark One previously copied the target's like a Xero Droid.
 * The Dark One is the first enemy that can naturally spawn other enemies, not counting Droids with the Random modifier.
 * It does a special animation whenever it summons something, raising its arms in the air.
 * This is the only enemy that drops an exclusive evil item with that being Bat Wing.
 * The Dark One is immune to most items, spells and abilities, including the Wrath sin, only being affected by weapons.
 * Its scales with the world number, meaning that the health increases the higher the world number is.
 * After killing The Dark One, shopkeepers will be replaced by only their hat on the floor.
 * Entering The Darkness will change the death messages to be motivational and set their color to red, including the black text introducing you to the current world. This applies even if the world is cursed or blessed by a modifier.
 * The Skipping Stone used to completely skip the entire boss fight.
 * The Dark One used to have no limit as to how many minions they could spawn, which could crash your game if you could not dish enough damage.
 * The theme when fighting The Dark One is Ascension (Chest Fight) - The Binding of Isaac: Rebirth.
 * This entity has the most words in its name, being three.