Root's not gonna stick when a whole group is focusing the mob. That's why only earth pets are good enough for root-tanking to not be garbage, since they re-root every eight seconds or something. One root doesn't cost much mana, but having to keep every mob perma-rooted throughout every fight would be a full-time job for a caster. And while you can kind of afford to not care who tanks in Crushbone, a group of trash-geared people on a fresh server will not get away with that after level 20.
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