Robe of the Elder Scribes

Robe of the Elder Scribes is an epic cloth chest armor for DPS casters that drops from Nightbane in Karazhan.

The temporary damage increasing effect has a 20% proc rate. In game testing over raid boss fights has shown an hidden internal cooldown of 50 seconds resulting in a proc rate equivalent to 1 PPM. With a PPM of 1, the proc can be compared to +22 spell damage all the time.