While you mentioned "xrysoi.se," that site is generally considered an unofficial streaming platform. For better quality and safety, you can find the episode on several official services: The Tears of Uther Pendragon: Part Two - IMDb

It features the massive Siege of Camelot, complete with an army of sword-wielding skeletons raised by Morgana's magic.

It marks the first true duel between Merlin and Morgana, signaling the end of their friendship and the start of their "darkness vs. light" destiny.