Beast-Yeast was a extension on to the extensive campaign, starting on the third anniversary of Cookie Run: Kingdom. This new Beast-Yeast mode added a new thing for your cookies, Beascuits. These Beascuits added buffs for your cookies that were not able to be obtained such as "amplify buff" and "damage resist bypass".
Now let's go back to the story, so this starts out in a forest housing white lily cookies more drawn out story going on from the first campaign, a new Cookie "elder faerie" Cookie is the defender of the Beast cookies, which are the first holders of the soul jams. Something that was recently stolen by dark echantress Cookie, we as the player go on to fight this Cookie named shadow milk cookie, but he's a jack-in-the-box and os very dangerous. But we defeat that and go on. But I recommend playing it yourself, for the full lore explanation in the actual game.
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