Bravery Bonus

This is actaully two additional bonuses awarded to players for playing quests repeatedly on hard or elite. The first one is the base bravery bonus for doing a quest elite the very first time you ever do it on that character. It is +20%. This is on top of your streak bonus. And on top of the (upcoming) +80% first time on elite bonus - which you get regardless if you ran normal/hard already, unlike the base bravery bonus.

The other bonus is the streak bonus, which is 5% on hard and 10% on elite and stacks up to 5 times to a maximum of +25% for hard, and +50% for elite.

So it starts out at +100%, and eventually can reach +150%, if you only run elite.

There are also some restrictions on being over the level of the quest, and power leveling penalties regarding getting these bonuses.