All units start with inbuilt timer, when timer ends the units get buffed, become uncontrollable and attack anyone in sight (prioritizes closest target, secondary priority enemy target => So if ally target is closest, it will attack that first.) . Thus player has choice to suicide the units before timer is up, or send them in strategic death raids in wide formations, or as meatshields.
The player disadvantage has to be balanced by low cost of training, low upkeep requirements and generally lighter economy. Also a specialised caster unit that can turn low HP enemies into Worgen thereby providing a massive 'bulk zerging' ability.
If possible, add a whole nice campaign on the Worgens and how they came to be in the timeline and style of WC3.
The player disadvantage has to be balanced by low cost of training, low upkeep requirements and generally lighter economy. Also a specialised caster unit that can turn low HP enemies into Worgen thereby providing a massive 'bulk zerging' ability.
If possible, add a whole nice campaign on the Worgens and how they came to be in the timeline and style of WC3.