Summoning Efficiency IV  

As of writing, it seems there's only 1 item even rumored to have this effect: Swirling Cloak of the Elements. http://lucy.fnord.net/item.html?id=15866 I've searched and searched, and only found one clue on where it drops; a WTB post on a message board by someone saying it's supposedly a rare drop off a named giant in the plane of storms. He didn't even seem sure, and a single post found off yahoo isn't the most reliable source anyhow. I also saw a profile of a mage on an apparent uber guild website wearing the cloak. It had no mention of where it came from, though.

It almost certainly is an uber rare drop, and possibly doesn't even exist in the game. It seems SoE wants to cut down on mage pet canni. At 65, mages seem to either be using a general purpose preservation focus (such as preservation of xegony) or still canni'ing with the pre-60 pets. Sorry to disappoint all the mages looking for a better focus for pet canni.