Access Keys are an in-game resource used to unlock special features and events. Currently, they are required for the following:

• Access to shardX (1 key per month)

• Participation in Seasonal World every 3 months (1 to 5 keys depending on the season stage)

The Unlimited Access Keys pack lets you make a one-time purchase to gain permanent access to all features that would normally require Access Keys — including any features added to the game in the future.