Hero Syndrome:
Humans are not normally born with a Magic Root as other fantastical races are, rather they struggle to control mana. This is one of the two main reasons why Humans don't tend to be exceptional with the average adult having 6's for attributes. Humans born with a Magic Root are known as 'Heroes' as they are able to channel mana into their own body to become as strong, quick, and dexterous as an average Elf Warrior. The trade-off is that when adrenaline is not keeping them going, Heroes can be subjected to bouts of extreme pain randomly.