Horde mutators how to unlock them?

I have the first 3 unlocked. Do you guys know how do I unlock regen penalty, execution rules etc?

Yes how ?

Need to complete 50 on one level to unlock the next. Complete 3 mutator “advanced” and the next one in line will unlock “Elite”

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I completed several times horde maps,but because I always join in progress,never unlocked the mutators :smile: