o_o u should have some sort of Elemental Weapon ..
And if you are aiming for Mercenary, You shouldn't get Tidal and Temest [Not yet at least]
I'm 125/116 Buffalo trying to reach Mercenary as well
I got my Earthquake Sword and it's really great
[i have 129% Golden Sword]
If you can, try to get Earthquake sword and/or Inferno Sword then move to Mercenary [Boxer] skills