Swordmaster

1st bar is defensive in nature, used to survive multiple attackers & to apply DOTs & debuffs to prepare for a damage rush, use brawler & fire scales frequently to build ultimate, gain damage shield & protect against ranged attacks.
When your ready to go on the offensive just use fossilize to attack your targets recourse regeneration, throw out obsidian shard to stun then swap to bar 2.

Bar 2 is a high pressure high damage bar, after swapping from bar 1 you should have a second or 2 left from the last stun, so in that time use Rally & Immovable brute to buff, remembering to weave in light attacks to keep up the damage.
At this point your target will most likely try to heal or CC you, with Immovable you've got 9 seconds to try & burn them down, unless they are smart then they should start to run low on recourses thx to Fossilize. Use your Standard of Might, then a Wrecking Blow followed by a Critical Rush & just spam Flame Lash to finish off any remaining health.

You could always swap out Flame Lash for Executioner & be even more effective at Finishing off someone on low health but then you'd be entirely dependent on stamina on your 2nd bar & you'd have less self healing making you more vulnerable.

I use 5 medium & 2 heavy for armour, so I get full benefit with stamina & attack speed from medium while still boosting melee damage by 2% (4% with Immovable) from the heavy armour.

I find this build devastating against full tank DKs as it eats away at their stamina & once that's gone, so is the DK. Its also a surprise attack monster as Wrecking blow from stealth does massive damage & when followed up by a critical rush either kills or puts your target in a position where 1 more attack will finish them.

Happy hunting.