The Grotto of Skellige is a massive, half-submerged sea cave located along the desolate southern coastline of Ard Skellig. This hidden cave network is utilized as a vital meeting point during the late-game main story preparations for the final confrontation against the Wild Hunt. The interior features glowing luminescent moss, ancient stalactites, and hidden pirate shipwrecks, serving as a high-security tactical staging area for Yennefer, Triss, and the remaining Sorceresses of the Lodge.