This is my fun, cheesy open world PvE build. It camps flamethrower 24/7, and can maintain a passive 12+ stacks of might. The synergy between the Juggernaut trait and Mass Momentum is the key here. The Alchemy trait line is taken because of the increased Concentration, but also because it adds survivability.
I use Flame Legion Runes because they’re cheap and work well with the flamethrower, but you can do whatever suits you best. You can also swap your gear for tankier stats, or make it a hybrid condi/power. I currently use Berserkers, which is why the link has that.
I recommend using an on-crit sigil like Air or Fire for the extra damage, because the flamethrower’s Flame Jet procs them basically every autoattack. That’s also why I recommend using the Golden Dumplings – they have no internal cooldown, and as such you can possibly proc the might gain multiple times during a single Flame Jet! They are pricey though, so I don’t recommend buying them. But if you have some just lying around from the last Lunar New Year, and you want to use them, it’s fun.