Best Iron Spiral Merc?

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Rushton
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What is the best merc for an Iron spiral Barb? and what should his gear be?

I can't find any guides out there that include merc info.
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Crash
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use the short questions thread.

merc can be whatever you want him to be. depends on what your build needs. if you're the main damage source, maybe your merc does crowd control or buffs you or provides a different damage type for immune monsters that you cant kill.