You can tell this cloak is made of octolus hide, because just like the octolus itself, it's covered with horrifying eyeballs. If you concentrate really hard, you can even see through them! That's not likely to give you a magical brain tumor or anything, I'm sure.
(In-game plural: octolus-skin cloaks)
|TOP 10 octolus-skin cloak collections|
6. Donavin69 - 2 | 7. Mistress of the Obvious - 2 | 8. TheLetterM - 1 | 9. caducus - 1 | 10. Solve_Omnis - 1
Collection data courtesy of ePeterso2 and Jicken Wings