Dark, or Darkness, is a damage type featured in Bloodstained: Ritual of the Night. Dark powers are implied to have an otherworldly and/or evil origin, and thus, they are naturally harmful to living things, especially humans. Creatures that come from a hellish realm, like Gremory, have a natural affinity with the Dark element.
Light is the polar opposite of Dark, and as such, many enemies which are resistant to Darkness have a weakness to Light-based attacks and vice versa.
Description[]
There are weapons, armors, and some forms of magic that possess Dark attributes, either due to their origin or from their usage. Even if Dark-based weapons seem to have tempting effects, the fact that most enemies in the game are resistant to it makes them much less effective in most situations, especially when there are only a handful of Light-based enemies out there. However, while a Light-based enemy is difficult to defeat using conventional weaponry, this is where a Dark-based weapon comes in handy.