After killing Overlord Grikan, a chest will spawn behind the chair he sits in. It is part of the loot. Also got a malachite and random piece of class specific armor.
No it isn't new to the game. It is a lower level rune for Wizard spell research of the Al Kabor line of spells (all of which are not very good). It drops in any level 18-30 zone that one might find runes.
I found one of these about 7 months ago (something like that), I think in Runnyeye, not sure. I kept in the bank for a while just in case someone in my guild needed it, but couldn't find any takers. Now it's been sold long ago to make room in the bank. Can't remember what it sold to a merchant for.