The rampager's skill Roar does not last for the amount of time stated in the skill, and the artifact combination leaf + ring + grinder, which should add another second, does nothing at all.
I currently have the skill at level 3, where it is supposed to last for 2 seconds, but it lasts for only 1.6 seconds. With the artifact combination mentioned above, it still lasts for 1.6 seconds.
I don't know if it makes any difference that I am using the Roar skill on a shaman class. I have not tried it on a rampager class, which is where it originally belongs.
My characters name is Blastboy on the account also named Blastboy.
Edit: At level 4 it lasts for 2.3 seconds instead of 3 as stated. The artifact combination still adds nothing.