Is Mantra 5 or 10%?

[Hundred]

Well with Fracture while the DoT is increased. That's not actually doubling the damage. Since it's 15s + 100 potency at the start. At 20 potency a tick and a tick being every 3s, the trait only adds 100 potency. Thats a 50% improvement.
I thought maybe because there are other sources saying that its 10% it may just be that the in-game text might be false so wanted to see if anyone confirmed. Since well 5-20% is like 4x better and most traits don't make a skill 4x better which is why I wondered if it was a mistake.

[Purplecannon]

The other monk traits are also pretty big increases. The 15% avoidance cooldown becomes 25%. I think the 5% just seems underwhelming to a tank because the ability doesn't just affect you it affects everyone in the party. As an off-tank who may not be tanking mobs the entire duration of a fight (there aren't many fights like that currently Turn 2 is all that comes to mind) the 5% applied to everyone including the other Tank during times of high raid damage seems like some good utility.

[Tang]

Well with Fracture while the DoT is increased. That's not actually doubling the damage. Since it's 15s + 100 potency at the start. At 20 potency a tick and a tick being every 3s, the trait only adds 100 potency. Thats a 50% improvement.
I thought maybe because there are other sources saying that its 10% it may just be that the in-game text might be false so wanted to see if anyone confirmed. Since well 5-20% is like 4x better and most traits don't make a skill 4x better which is why I wondered if it was a mistake.

Some cross skills are better then others and some traits can make a move radically different from how it started. Thats all I can say.

I speculate it was done to make Monks/pugilists more appealing to take to raids.