He was only mentioned by The Emmisary to awake his power.
Smash Bros. Lawl GalaxyEdit
Final boss of Classic Mode and the final chapter of SSE.
Rosa Anarchy vs. Hades' DemonsEdit
Although he didn't appeared in Rosa vs Hades' Demons, but he was mentioned by John.
A meteor shower of dark balls that can't be touched by other players (even though they can touch them) rains down and deals 250 damage to every player.
A tidal wave silhouette crashes forward at a player, dealing 375 damage.
The Darkness takes on the form of someone in your party and has all of that member's abilities that do twice as much. It can be defeated by defeating it in copy form.
A hypnotizer move. The Darkness moves a shady hand over a party member and turns him/her into an overshadowed character. Defeat the overshadowed character to knock back some sense.
A powerful ray of shadows is shot, dealing a whopping 625 damage.