Ice Bow / Maiden Amazon
With strong crowd control due to Freezing Arrow, the Frostmaiden crushes any area without Cold Immune monsters. While she does run into some single element issues, having a strong Mercenary helps her out a lot. Overall, this build is a fun way to play the Bowazon through Hell.
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Video Build Guide
She does not require expensive gear to be effective, but she will lack considerable Damage without her expensive gearset.
If you like playing from a distance and supporting a group or watching enemies stand there as you freeze them to death, then you will enjoy this build a lot.