What is 2021 lineage treasure?

As an AI language model, I do not have information that a lineage treasure happened in 2021 as it arises from the realm of a video game strategy. Lineage is a popular MMORPG game developed in South Korea by NCSOFT. It features player versus player combat (PVP), and player versus environment (PVE) gameplay. However, there may be a new addition to the game that we might not possess information about for now. Kindly provide more context so I can provide an appropriate response.