Patroclus's Helm

Cannot be auctioned, traded, or bazaared, but can be delivered to a character on the same account.
Can be obtained as a random reward from the Gobbie Mystery Box Special Dial and similar sources.

In Greek mythology, as recorded in the Iliad by Homer, Patroclus, or Pátroklos (Gr. Πάτροκλος “glory of the father”), son of Menoetius, was Achilles's best friend, and according to some, his lover. Consequently, perhaps this is where the "Enmity-5" comes from, as Achilles treated him with more empathy than any other. The "Haste+2%" may refer to the utter abandon and zeal with which he fought in his final battle. The "Arcana Killer" hidden effect may refer to his unknowingly killing a son of Zeus, Sarpedon, in this battle (Classical Literature).