Zealot
7.5-15% Weak Spot Damage. Weakspot Kills also ignore Enemy Hit Mass.
60% Strength on your First Attack every 3.5-5 seconds.
5-8% Strength for every 10% of magazine spent during continuous fire. Stacks 5 times.
24-36% Reload Speed if empty.
The dominion of the Speed Weed™ class is one for which crafts a man into a demon of crowd control, special/elite slaying, boss melting, front lining, and hefty support for your team as nothing can truly stand in your way. While many builds offer a focus within a handful of these categories, this build considers wherever you need to be and ensures you are capable of decimating heretics--no matter their size.
For the most part, you will be relying on the tactical axe (and subsequent critical hits) alongside both Fury of the Faithful (FotF) and Blazing Piety (BP, or Fury). Paired with a keen ability to dodge enemy attacks with precision, these perks in and of themselves become both where the primary special/elite deleting and front lining potential comes from. With a heavy attack, FotF will close any gap between you and a higher tier enemy and insofar as you hit weak point upon activation, almost all specials are done for. This is particularly useful in instances such as a large force of ranged enemies unloading into your team during a horde scenario; where branching off to deal with the damage can be done by you in very little time. As a side note, while this is likely the case for other zealot builds, even a charging mutant can be struck down by a well placed FotF-heavy attack by launching yourself directly towards it and landing a weak spot hit. The combat ability regeneration in the curios speaks to this will keep your toughness high alongside the absolutely criminal amount of killing you'll be doing.
In terms of the flamer, this is like your older brother you send after some kid who stole your lunch money. For the most part, as stated above, your melee capabilities will keep you in the game with your toughness maxed out. But--when the night flames with fire and there's no hope for humanity, whip this thing out and it is literally over for anything in your path. Due to the staggering, impact, strength, brittleness, and potential exploding of special enemies unlocked with mastery of the flamer, it becomes an ace in your sleeve during moments where not just crowd control needs to occur, but control itself must be retained. Is your teammate surrounded by 6 ragers? Blast 'em. Is a boss charging towards your team during a horde? Blast 'em. Are you in some weird limbo-hell where there's like one hundred enemies dispersed within a large area? Do 5 360s while blasting 'em. It is due to this quality that you will always have ammo and do not require some unnatural amount as other builds sometimes do; especially if you have a veteran with survivalist as you'll be going so nuts with FotF that your ammo will replenish quite a lot.
Extending the notes on using the flamer, one very important quality in using it is to know when things are dead. This may sound ridiculous, but particularly with hordes, I see a lot of players using way more ammo than they need to for the sake of theatrics or something. Concentrated secondary fire will kill most enemies in 3.9 seconds (I made that up), and given that your flames go through enemies, you don't need to go rambo clearing hordes. That's why the flamer's primary fire is often useful, particularly for support purposes in staggering anything going toe to toe with your teammates as it offers a controlled inturuption to whatever heretical garbage is going on.
The only weaknesses that I can think of are that this build does not allow you one shot bosses and, due to the nature of the flamer, will not enable you to take out targets at long range. While you can still do a fair amount of boss damage with concentrated secondary fire from the flamer, or even 1v1ing with the tactical axe (although this will not be quick), it does hugely benefit you to have incoming damage from your team due to the brittleness you'll be hitting that boy with.
Anyway, have fun and tell 'em large marge sent ya.