The problem here is casting every 20 seconds. Spear is also mana free, and it lasts 13 minutes lol. You just need to proc it once.
The 10% is a problem because you have root for mobs that need to run. For mobs that should be snared, like casters, you need to wait longer to stop them from casting. Then, you need to cast the necklace every 20 seconds, assuming no resists.
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