hi I have a quick question: do you need to complete Grizzleheim for the main story since I just started Zafaria and don't know if I need to do it thanks
Grizzleheim, like Wysteria are side world contents and hence do not contribute to the main storyline of the game.
I do however strongly recommend you complete both Grizzleheim & Wintertusk if you haven't already as completion of the latter is necessary for all future school pets and more importantly, some key school spells!
