The oilskin cloak is, in effect, a permanently greased cloak; it is therefore prized for granting immunity to the drowning attack possessed by eels, so long as the oilskin cloak is not cursed. An uncursed oilskin cloak will also protect metal body armor in case you decide to go moat-diving. It can readily be identified by its unique appearance (slippery cloak), or the message "The slippery cloak fits very tightly." when wearing it. It provides MC3.