Root duration is random, however certain root spells are more powerful than others in terms of their potential duration. Any damage dealt to a mob through spell casting seems to have a chance to break root. It also seems that root can break randomly during any 'tick' of it's duration on a mob. I'm not convinced that a mob's MR has anything to do with the likelihood of root breaking on each tick, or that it has anything to do with the duration of your roots. I believe that MR is only used for the initial resist check of your root spell; I could be wrong about that though.
Root is just your basic entry level root.
Enstill is an upgrade to root.
Immobilize is meant to be a fast casting, short duration root.
Paralyzing Earth is the best root spell you get.
Nuking with any root is going to cause it to break, though.
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