Talk:Trading and Gifting/@comment-24154365-20131110221836/@comment-4613046-20131111141853

This is quoted from the above page under Item Trading Restrictions.

The following items cannot be traded:
 * Purified Bitterblack Weapons and Armors. (Cursed items can still be traded, however the outcome of the purification is random to each player)

This means that the Revenant Wail, which is a purified Bitterblack Weapon, can not be traded. I'm afraid you're on your own for that.