Easter Eggs and References in Assassin's Creed Valhalla refer to other pop culture media like GoT, Harry Potter and so much more. Check them out here
You can signal your friends and confuse your enemies by ringing this bell, where most other players will have no clue how and where it came from.
Unlock Easter Egg from Anthem's Main Menu. The very first Easter egg in Anthem is the Konami Code music and this guide will show how to activate in the game.