Melissa's Cloak is an Artifact cloak, the first cloak with the property of additional durability. It has +5% fire resistance but cannot be enhanced. It can be blessed using a Clothing Bless Deed, and can also be dyed. The cloak will lose durability as any other piece of equipment and can be repaired. However Powder of Fortifying can not be used on it.
A bug initally existed in which the cloak erroneously behaved like Powder of Fortification. Double-clicking the cloak brought up a target cursor and asked which item to fortify. The target would gain 10 durability and the cloak would be destroyed. This bug was fixed in the update following Publish 54.