Grizzleheim is like any other world besides the core of Wizard City, you pay for it either via membership or crowns. The level 10 quest you did was something of an introduction/prequel to the quest you will recieve at level 20-Ambrose will give you the Spiral Key for it-that will let you begin to begin to explore Grizzleheim and complete the world as a side world not involved in the main storyline quests.
Grizzleheim is like any other world besides the core of Wizard City, you pay for it either via membership or crowns. The level 10 quest you did was something of an introduction/prequel to the quest you will recieve at level 20-Ambrose will give you the Spiral Key for it-that will let you begin to begin to explore Grizzleheim and complete the world as a side world not involved in the main storyline quests.
I believe it is a level 5 or 6 quest, not a level 10 quest.