I can see very few people on here play a Shaman full time, or it is their main. If you want to piss the hell out of your Mana just slow every Mob. Slow is a total Mana Sink hole, and Haste is not far behind. No way you can take over slowing, hasting, healing on a Shaman, even with Canni. Torpor maybe.
A Ikky Monk and a Shaman are a Marriage made in Heaven. When both have their Epics, they are just a plain killing Machine Duo.
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And it even gets better in Velious. Top dog Duo by far.