The Shadow

The Shadow is an uncommon enemy that is mostly exclusive to The Darkness. They are only spawned naturally during the fight against The Dark One, where the boss will periodically spawn The Shadows along with The Corrupted or The Phantom. However, they can also be discovered outside of The Darkness, via a rare outcome from a Mystery Button. They replace natural Anti and Friendly droid spawns in their corresponding worlds as of 1.5.

Appearance
Similarly to other Droids in the game, The Shadow has the typical Droid helmet, but much like the other darkness enemies, they have a fully black appearance.

Behavior
Whilst having the same attack pattern as most enemies (walk towards you), they have an insanely far sight range, high damage and are invincible. To make up for that, they are very slow, and do not need to be killed to clear the room, unless it had somehow been spawned "naturally" which is impossible as of currently.

While The Shadows summoned by The Dark One immediately die when their summoner is successfully vanquished (along with anything else it summons), any Shadows that weren't spawned by The Dark One outside of The Darkness (from a mystery button, for example), will follow the players until the next world, until it disappears with the message “The Shadow fades away..” after 10 rooms.

Trivia

 * The Shadow is naturally the slowest and most fragile enemy in-game. (Natural stats are their default stats, without any modifiers.)
 * The Shadow is the only droid in the game to have a message when killed. (10 rooms after it spawns from a mystery button)
 * Before 1.5, The shadow that spawned from mystery buttons used to never “fade away”, and the only way to kill them at that time was with an anti droid who gained piercing modifier from necromancer.
 * Interestingly enough, The Shadow used to be able to get the Radioactive modifier from Reactor Droids, but this was patched in Beta 1.4.
 * During the fight with The Dark One, The Shadows spawned from The Dark One slowly accelerate in speed.
 * There is only one way you can kill The Shadow, which would be getting the "Piercing" modifier onto any droid that can hurt other droids (such as Anti Droids and Undead Droids) though this hasn't been confirmed. The only way to give such droids that modifier would be using the Necromancer class.
 * As of v1.5, using the item Crystal Torch, it is possible to remove the forcefield on The Shadow, which in turn allows you to kill them, or you could use Pocket Nuke (there's no link, I'm sorry) if you're THAT desperate.
 * The Shadow is weak to, though with its forcefield the only effective item is the Flashlight.
 * DJ is able to kill The Shadow using her second ability with the purple disc. (?)
 * The Burning and Shocking spells are also able to kill The Shadow as well.