Beast yeast! Shadow milk exists and it's going to be exciting baby!
First, the potential pattern of the upcoming beast-yeast episodes.
Since Shadow Milk was the previous bearer of Pure Vanilla's soul jam and Pure Vanilla was the first of the 5 ancient heroes we meet I think it's safe to say what the order is going to be;
1. Shadow Milk
2. Eternal Sugar, Hollyberry's forebearer
3. Mystic Flour, Dark Cacao's forebearer
4. Burning Spice, Golden Cheese's forebearer
5. Silent Salt, While Lily's forebearer
With that out of the way I propose something else that will be a theme during the episodes; the soul jams.
During the ep2 teaser we see what appears to be Shadow Milk's part of the soul jam calling out for Pure Vanilla, whether it wants to become one with PV's or asking him to purify them we'll have to wait and see. {but with the eyes around it during the trailer it could be Shadow Milk's trick}
I think throughout beast yeast the old soul jam will be calling out for us.
Perhaps the other heroes will think we've been gone to long and ride an airship to save us so we can have a happy reunion and have the old soul jams calling out to the new wearers.
But that's just a theory! A Beast Yeast theory [ha ha I have no life]! Stay crunchy!