1. During the event period, users can acquire three different contamination samples by completing missions and carrying them out of battle;
        2. Users can acquire higher value samples through free exchange between users;
        3. If you sell the samples to Anna, you will collect an event currency reward;

The Source of Contamination:

        1. During the event period, users can acquire currency by completing daily missions and weekly missions and contributing to the overall server research progress;
        2. When the progress of the server reaches a certain value, the corresponding reward is obtained;
         3. Exchange Event Currency for permanent Legendary tier rewards in the Exchange Shop;