Re: BUG WITH WIZARD ZOMBIE UPGRADE
This is a known issue. The Zombie Wizard perk "Two-Headed Dragon" was disabled in the latest patch due to an invulnerability bug. It will be re-enabled once this bug has been resolved.
Source - https://answers.ea.com/t5/Bug-Reports/wizard-ability-not-able-to-be-used-as-master/m-p/8870028#M1991
