My idea is its going to be like the continent with the little emeralds maybe those could be souls and if you collect like 1000 or 750 that could getyou a monster and the island will be called soul island
My theory is that it could be a new subspecies of magicals that are dead and we have to vitalize the power of monster eggs to revive them. Heavenly Quartet: Vhamp (Starhenge) Buzzinga (Fire Haven) Tuskski (Faerie Track) Auglur (Workshop Track 2) 110 BPM and G Minor
If it has to do with souls then probably we would have to probably use a new machine mechanic to get the elements they have and revive them back from the dead
