Autumn Leafi Leaf is a crafting material that can be obtained from Autumn Leafies of course, either by killing them or by taming them and harvesting from them after they have become your Pets. There are three variants of Autumn Leafies that are of slightly different colors, but they will nonetheless all drop the same kind of spotted Autumn Leafi Leaves. You can find them in Forests spawning during (ingame-)daytimes around or on Moccha Autumnwood Leaves that often cover the ground under Autumnwood-trees. Rarely they can also be found around other trees like Ashenwood.