One thing that we forgot was that when Pin was possessed by a shushu - Rasha, the brother of Rushu - he did not completely got rid of him, but only suppressed him.
Rasha is a powerful being able to face off against Gouldard and Tristepin. He clamed that he was sealed for millennials by the Iop god. I wonder why a Shushu is in the Inglorium.
Since Rasha is still in Pin, I wonder if he could be linked to the events leading to Waven. In a YouTube video by a fan, it seems like the world in the game Waven is invaded by Shushus. I have not played the game but these beings are seen tormenting and taking control of Ogrest. Gods are also attacked by Shushus.
Here is why I think that maybe Shushus are going to be important players in the events between Wakfu and Waven. They will come back and make sure that the World of Twelve pays for their defeat in season 2.