Creeping Darkness is the first power you gain in The Darkness. It allows you to detach a tentacle from your body and send it out to scout or kill opponents without approaching them physically.
You lose control of Jackie while using this power, but can guide the tentacle through spaces that you normally wouldn't be able to, such as through air conditioning vents. The tentacle can flip switches, knock out light sources, destroy locks, and kill enemies, but will constantly drain your Darkness Energy while being used, so you won't be able to use it for an infinite amount of time.
It can also be seen by enemies and shot at, so if it starts taking too much damage it will retract back to Jackie. This won't cause any damage to you, however. While using this ability, Demon Heads have yellow glow. This ability doesn't return in the sequel.