Just a warning for those of you who haven't seen (or not seen) this for yourself.
Myself and several others where in the Mithril fields east of Aughundell to clear it of the anchor and blight mobs. We battled for several minutes, only to discover that the mobs were spawning in one exact spot... but there was no anchor. Nothing, zip, nada. We continued killing mobs with our AoE's in hopes of at least damaging this invisible anchor (?), with no success, nothing registered in combat chatter that there was even an anchor there. After several minutes of this, more and more blight mobs spawned, until our group was overwhelmed and eventually slaughtered.
Until this bug (?) is fixed or they suspend anchor activity with the next patch, please be careful while hunting anchors, or your local confectioner will be doing a brisk trade.