Getting 1 HP per level from the Toughness feat, though, only makes it appealing at higher levels you see. I would make that an Improved Toughness or Greater Toughness feat instead, with Toughness as a prerequisite. I prefer to change Toughness itself to granting +4 HP each time it's gained, or +5 HP with the caveat that it cannot be taken more than once every two levels, so a mage can start with decent hit points and keep it up over time, but can't end up with as much or more than the party barbarian. Another option is to change Toughness so that each time it is gained, it grants HP equal to 4 or the character's total base Fortitude save, whichever is higher at the time the feat is taken. This makes it's power more proportional to the class of whoever takes it; classes with high Fortitude saves have decent or good hit die types and will get proportionately the same benefit at middle or high levels.