Ultimate
For your General Skills I recommend taking Firebomb as your Firebomb skill has the shortest cool time of all your abilities and the stun is a little more useful overall than the knock back provided by Napalm. The Attack Spec you choose really depends on what character build you started with. If you are going with 50/50 SPD & CRIT either Focus or Boost would be your best two Specs. If you are going with full DMG then Zeal will be the best Spec for you to have. If you're going with a DMG/CRIT build like I am however then Divine Power or Callousness will be the Attack Specs you will want to choose from. For Advanced Skills you will want the Flash Storm upgrade as it's just far to efficient no matter what build you're using since it reduces 8% armor at a 100% chance. With Demon Seal and Flash Storm you will be shredding on Guardian's and Bards like no tomorrow. For Defense Spec the only useful one in our build is Vigor. With our Tactical Spec we will once again be going with the one that reduces armor called Break Defense. It has a 25% chance to activate which is basically 1 out of every 4 attacks, with our skills being highly spammable it's almost guaranteed to activate so this is once again just far too efficient at allowing us to shred on those Guardians and Bards. As for the very last category, Special Skills The Best Defense is the best mastery to take here as 1% of our damage will add quite a considerable amount to our defense. If you're rolling a CRIT/SPD build I would suggest taking the upgrade for Shattered Void however as the DoT added would be very useful to stack with your Demon Seal and Blood Seal skills.