The Shadow of the Erdtree takes place in the Land of Shadow, a completely new world separate from the Lands Between in Elden Ring3. This realm is accessed by interacting with Miquella's Cocoon after defeating both Starscourge Radahn and Mohg, Lord of Blood in the main game.
The Shadow of the Erdtree introduces a new story set in the Land of Shadow, with new enemies, weapons, equipment, weapon skills, and magic not found in the base game3. It also adds new leveling and combat mechanics, such as the Scadurtree Fragments and Revered Spirit Ashes. Additionally, there are new bosses, NPCs, and enemy types, as well as new quests and storylines for players to explore.
Sir Gideon Ofnir, the All-Knowing, is a character in Elden Ring who serves as both an NPC and a boss. Initially, he is an ally to the player, offering advice and guidance at the Roundtable Hold, a gathering place for other Tarnished. However, as the game progresses, he becomes an adversary, attempting to prevent the player from becoming the Elden Lord. Despite his vast knowledge, he is not a particularly challenging boss to defeat.