The Chilla skin can be found at the Ancient Tower. If you do not know where the 
Ancient Tower is, find a long stairway in the Enchanted Kingdom that leads up to 
the throne room. Go left to find a passage leading to the Ancient Tower. There 
is a squid person there who needs you to round up her children. Equip Major 
Ruin, Chilla, and Ash to do the tasks. You will find a ramp that Major Ruin can 
go up. Then, use Chilla. You must repeat this process for each level along the 
way. On every level is a squid child. They will be frozen in a block of ice. Use 
Ash to melt the ice and the kids will go to their mother. Continue up the ice 
until you reach the top. The little bug things will make it difficult all the 
way up, but it is possible if you keep trying. Once you get to the top, you will 
find the last squid child and be rewarded with three elemental fruits, as well 
as the new Chilla skin. Get the skin, then work your way to the bottom. When you 
get there, collect your fruit.