Opposing group needed for high level wizards

[Chrono22]

A karsite/half iron golem barbarian/frenzied berserker with the mage slayer feats. Mix in some levels of fighter for spiked chain proficiency and some other decent tricks.
For equipment, create a continuous function item that actively harms the wearer with an incredible amount of fire damage. This will act to heal the half-iron golem and give him a constant haste effect. Items that raise his resistance to electricity damage, increase his tactical mobility, and his spell resistance are also a good idea.
Also grant him a couple of 1 time-use beads (thrown weapon) of antimagic field.

Obviously this character would be designed for killing spellcasters... let's say he was experimented upon by them due to his karsite heritage, and seeks retribution against all magic users for the sin of using magic. An anti-magic paladin, if you will.