The Epic Staff is the default staff of the Epic Robe which comes with the Gamer Bundle DLC.
The Epic Staff allows you to buff yourself with Whispers of Alrond, whereupon a countdown bar similar to that of the Shield spell will tick down underneath your health bar, and a black chaos star appears underneath your wizards feet. The buff lasts longer than it takes for the staff to recharge, making it possible to keep the buff up indefinitely. While Whispers of Alrond persists everything you do becomes ~11% more powerful, this goes for weapon damage and heals as well as spells and shields or barriers. Other than this the weapon is equal to the Default Staff.