Where does Spirit of the Howler drop?

[Troxx]

Most zones that drop 54-59 spells revolve around grouping.

You'd probably (at least I did) get this spell fastest by farming pp and buying it rather than trying to camp the drop solo.

It's totally worth getting. The 55 shaman pet spell summons a pet with quite a bit more hp and a much higher average summon level than the one preceding it. Max summon hits for 52. If you have bothered to camp/buy/quest a mage item with inventory pet reclaim, it's not a bother to summon even at 850 mana a pop, and in a pinch you can use the pet for both dps and a quick emergency "oh shit" 850 mana reclaim. A max or max-1 summon that hits for 52 and 51 respectively will also tank and soak damage comparably to a well geared monk once buffed. Give it ac and agi and it tanks quite well ... with a passive regen of 30/tick.

My only gripe is that without epic it can be hard to use it as a tank efficiently while simultaneously out-damaging it (it will do ~20dps buffed/hasted) so it doesn't eat 50% xp.