A gate made from Void found in various places throughout Hallownest. they are indestructible and cannot be deactivated. If The Knight moves into it, it will bounce them backwards, but deal no damage. Spells pass through Shade Gates.
To move through it, the Knight must use the Shade Cloak and Shadow Dash through it. This means that any area blocked off by a Shade Gate cannot be accessed until later in the game, after the player has access to The Abyss.