Arachnid
From The Wajas Wiki
Arachnid is a Dye Marking that places the silhouette of a spider across your waja's back. You can add this marking to your waja by use of an Dye Arachnid.
Marking Appearance
All examples feature wajas with a FF0000 (pure red) marking. However, this marking can come in any Hex Color as well as any Texture.