Board Thread:Wiki discussions and announcements/@comment-4256804-20140724203012/@comment-24792363-20140725212731

Before patch 4.12 it was a mythical item, as it built out of the legendary item Grez's Spectral Lantern which built from vamp specter and cloth armor. It used to grant health, AD, lifesteal, and armor. Now it no longer builds from Grez's and instead build from the Wicked Hatchet and the Cloak of Agility.

In summary, it was mythical, now it is legendary. The various item pages are not always updated at the same time if they are updated at all. You're correct in that it should be changed.