The season 2 trailer shows a monolith at the heart of Cintra, but what are monoliths and magnaliths? Here's everything you need to know about their importance ahead of #TheWitcher2: Monoliths are an "inexplicable phenomenon" – enormous pillars of obsidian stone. Scholars study them, but don't know who made them. The monoliths "might still hold valuable information about the ancient civilisations that preceded the human race and possibly even the elves"