Dark Screen (ダークガード, Dāku Gādo?, lit. "Dark Guard") is an ability introduced in Kingdom Hearts Birth by Sleep. It increases the user's resistance to Dark-based attacks. It can be multi-installed to increase its effects.
In Kingdom Hearts 3D: Dream Drop Distance, Dark Screen is a stats ability that increases Dark resistance by 10%. It can be equipped up to five times.
Learning Dark Screen
Kingdom Hearts Birth by Sleep
Kingdom Hearts 3D: Dream Drop Distance