You can do it w/ a single Mage although it is a bit more complex this way. Hunters/Priests can both force a retarget of the Chains so if you keep them out with the Mage, you should still be able to game the mechanic. Make sure everybody in the ranged group has these WAs:
Normal chains:
Code:
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Empowered chains:
Code:
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(Note: Make sure players go to Trigger and type in their own names otherwise it will not work.)
You have about 3 seconds to react to the chains so unless they're tunneling hard, both the Hunters and the Priest should be able to drop fairly effectively.