Question about skill Dual - Master's Rage !

Is that skill usefull for tyrr doom or Dual - Berserker's Rage ? Anyone can help ?

Dual - Berserker's Rage Has a chance of P. Atk. + 27% during an attack.
Dual - Master's Rage Has a chance of Skill Power + 27% during skill use.

Thanks.

Question about skill Dual - Master's Rage !