If the pet counting as a target changes they can still be pretty useful. 1 little trick I used to do though to get around this with the earth pet is:
Wait til pet roots mob, back off pet just a bit out of melee range then cast rain spell. When root breaks the mob will move forward towards the pet but still be in range of the rain. Pretty much the only way to get all 3 waves on a mob as a solo mage. It can be handy for burst damage since you can cast a nuke right after and get some nice short dps.
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