The Crystal Skull is a quest item found near your camp after you fight the ghouls at the beginning of the game. It may be very important later on so make sure to loot right away, or at least before you leave White Orchard and travel to Vizima.
I’ve been playing PC games since the late 1990s and have always enjoyed RPGs the most (Dragon Age, Mass Effect, Elder Scrolls, WoW, Dark Souls, etc.). I had tons of fun playing Witcher 3 so I made this website for discussion, guides, and other info. Hopefully, you find something useful or interesting!