I guess I'm really dumb but where is the bone field? I go up through the World End Tower and there is a blocked off ice mountain area west?
Viewing post in Legend of Door ~Gale Wings~ comments
The area you’re looking for is Gilgoles, the entrance to which (Pelton Canyon) is located east of the snowy area. Making it the Bone Field requires traversing the area in a particular way to reach its northwestern section, represented by three dead trees (which should be visible before even entering Gilgoles).