Secondary Forge is a special Gold Smoke Knight AI card and Survivor Status Card found in the Kingdom Death: Monster Core Game. It was introduced to the Core game in the Kingdom Death: Monster 1.5 Update Pack.
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At the start of the showdown, give this to a survivor with the Thunder Maul rare gear. If there is no such survivor, archive this card.
You may challenge the monster's weapon with your own. When the moster would perform Blacken, if you are in the Smash Zone, you may 
Hammer and Nail.