Skelecogs are incomplete cogs or skeleton versions of the cog. Skelecogs can range from lvl 4-12 and have the exact same attacks as the form they take. For example: Here when we click on the skelecog nametag, it shows that it's a bigwig. This means that it has all the same Bigwig attacks. Skelecogs are commonly sighted in: Boss battles, or factories. Unless there happens to be an invasion, that's the only place to find them.