Images:

gw2-knowledge-is-power-focusgw2-knowledge-is-power-focus-2gw2-knowledge-is-power-focus-3

Set:

Slot Item Name Trading Post Preview Code
Focus http://db.dulfy.net/item/44961 GW2 TP [&AgGhrwAA]

Where to Obtain:

Champion loot bags: Elaborate Ritualist Bags, Gilded Coffer

Particle Effects:

Yellow mists on either end and the page flaps around.