Shadows are like more powerful wraiths. They can float infinitely, and have 300 HP and deal 30 damage. They can do more then just bump into you, though, and they have 20 defence. They look like a wraith, but darker, with green eyes. They only appear during Darkness Engulf event.
Bump: Simple. Deals 30 damage. Basic attack.
Dark summon: Spawns 10 Wraiths. Uses at 200 HP, again at 100 HP.
Cursed Fire: Shoots a ball of green fire. This inflicts Cursed Flames on you, and does 25 damage.