The master mode in Lab quest ( every 8 hour quest) you can choose the buff by using roll , i an fighting with unstoppable colossus and I choose the buff which has regen 200% . I choose that cause it says it will give 200% regen as ability. Unstoppable colossus didn’t have regen so I choose that buff. Look what happened.
Twice he got regen, how this can be possible.

Twi

