The Icy Aerie is the home of the Winter Wizard Arcticus Frost.
To reach this place you have to make the Mission Find The Crystal Key To The Icy Aerie:
- The key is in The Chasm
- To get in to The Chasm Levitate above it and wait till you drop down
- Then use the key at the Crystal Keyhole in Presto's Edge (it's in your Loot in your backpack)
- Then you travel to the Icy Aerie of Winter Wizard Arcticus Frost
There isn't much to do there unless you need to see the Winter Wizard, but on his left is the Green Crystal which you can then use to get a chromatic critter (meaning you have more colors to change it in) at Kan the Geomancer in The Explorer's Camp next to the Jaguar Temple.