The item drops off:
* Avatar of Flame in Lavastorm
* Avatar of Hate in Nektulos Forest
* Avatar of Storms in Thundering Steppes
* The Seventh Hammer in Everfrost
* Avatar of Below in Butcherblock Mountains
* Avatar of Disease in Antonica
* Avatar of Fear in Feerrott
* Avatar of Growth in Lesser Faydark
* Avatar of Justice in Everfrost
* Avatar of Miscief in Rivervale
* Avatar of Tranquility in Lesser Faydark
* Avatar of Valor in Commonlands
* Avatar of War in Zek, the Orcish Wastes
Avatar's are all 88^^^ Epic x4.
Source:
http://eq2.wikia.com/wiki/Staff_of_Limitless_Growth