The dark, mysterious chamber with glowing purple lights and the ominous mural.

The video opens with a dark, ancient-looking stone chamber with purple glowing braziers. The scene transitions to a ritualistic setting with a central figure in ornate armor kneeling before a stone altar, surrounded by robed figures and numerous purple candles. A large, ominous mural of a creature adorns the wall behind them. The camera zooms in on the kneeling figure as they interact with a scroll. The scene then shifts to a dark background with glowing, intricate symbols and text appearing, culminating in the title card for 'Path of Exile: Return of the Ancients'. The final frames display release information and a website URL.