Main Skills
Volcanic Fissure - I prefer Upheaval I over Branching Fissures I but it's personal preference. When you get Kaom's Madness (massive buff in 0.4), it really supercharges your clear but Upheaval I or Upheaval II is still good. Additional fissures feel much better than just branching them imo. With modifiers like 
Splitting Ground upheaval isn't entirely necessary but again, it's up to you. You can craft Abyss prefixes to add more fissure chance in combination with Splitting Ground but that passive investment now and don't think it's worth it.
You're next core supports are Elemental Armament II, Fire Attunement and Fist of War III. I talked about Fist of War III in the intro but again, the combination with 
Ancestral Empowerment is too good to pass up. When you get a six link go ahead and try for Rakiata's Flow. Use Longshot II or Close Combat II if you don't find Rakiata's Flow.
Remember, we want Volcanic Fissure to hit decently hard in order for it to ignite so we can utilize 
Ancestral Cry on cooldown.
ONE BUTTON CLEAR Volcanic Fissure
ARMOUR EXPLOSION FOCUS
A "one button clear" for Tier 15+ maps setup (this is for highly dense packs/whites/blue) is possible utilizing Armour Explosion. I do this by combining 
Shattering Blow with increased armour break % from the tree (just need two more nodes in addition to 
The Molten One's Gift node). This gives guaranteed armour break on heavy stun. We utilize Armour Explosion to help supplement clear and make sure we use support gems that also apply to armour explosion, vastly increasing Armour Explosion dmg and clear. Swap out Longshot II and Close Combat II as you see fit / personal preference. Just spamming Volcanic Fissure clears really well and it feels the best rather than doing some 
Leap Slam or 
Stampede with Crater stuff.
Volcanic Fissure also gives us our Ignites to generate Glory for Ancestral Cry.
Ancestral Cry use when you have 5 endurance charges (thanks to Stampede) and you will having 50 second duration with zero investment, literally giving you huge uptime more than half the of time you spend in maps. Ancestral Cry is incredible for all map / league mechanics and you just clear my walking around, "slamming" the ground and proccing fissures over and over again for great clear.
Armour Explosion usually feels like it's enough for clear but you can also fit in Fiery Death if you want some more clear / corpse deletion / corpse explosion...just keep in mind that the Ignites to generate glory, most of the time you get them from the Armour Explosion and not Volcanic Fissure (in this setup) fissure itself since it does not inflict huge 
Flammability magnitude.
HERALD OF ASH / Ancestral Empowerment / Fist of War III FOCUS
MY PREFERRED METHOD^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
This is a much more "classic" clear method, where we rely on just doing MASSIVE damage (as much as possible) without external factors like Armour Explosion or Fiery Death / other on death / supplemental effects.
This method, in combination with Ancestral Empowerment plus Fist of War III (fist of war 3 does benefit ALL ancestrally boosted attacks) does massive damage which with good enough gear clears very well on its own.
This focus is more of a two button clear method, where after Volcanic Fissure you use Stampede.
Other Main Skills
Rolling Slam is mechanically the best suited for my fissure build..although this is just my opinion. Having two slams, the first part and second - you have four potential fissure triggers. Not only that, but the damage multiplier is absolutely insane and with increased skill speed it doesn't feel bad at all to use for me. I can't understate how good this is for Bossing and really tough Rares.
Forge Hammer new to 0.3, an absolute BOMB of a thor hammer...massive damage and better fissure damage compared to Volcanic Fissure. You can throw your hammer for big damage and recast to return without putting it on cooldown which still does great damage. Most of time for rares you can just throw you hammer at them.
Warcries
WE ARE 
Warbringer NOW!!!!!!!!!!!!!!!!!
Seismic Cry - with the combination of 
Roaring Cries, Raging Cry and Enraged Warcry II you generate 16 rage - consume 15 giving you UNLIMITED Seismic Cry usage. This really smooths out the build and make Warbringer kind of redundant. Use Seismic Cry as you please but especially during stun windows. Remember, Seismic Cry will most of the time "stun" the enemy who is primed for stun so you don't have to wait for the actual stun. You will still get the empowered attacks.
Infernal Cry absolutely massive damage buff, you don't have to always use it while mapping but I tend to use it a lot. Unlike Seismic Cry cry - Raging Cry and Enraged Warcry II Infernal Cry only gives us 8 rage so use it liberally. If you rotate Seismic Cry > Infernal Cry > Seismic Cry you can infinitely empower you attacks, only be limited by mana.
Ancestral Cry - fantastic ability and just from a lore/rpg standpoint one of the coolest skill in the game. Becoming Kaom, slamming constantly, getting amazing clear, so visually sastifying...yea it' s just awesome. Getting endurance charges from my Stampede setup.
Supplemental Skills
Stampede - I only use Stampede in combination with Armour Break III and Enduring Impact II to generate Endurance Charges for Ancestral Cry. Stampede also just feels good to me now...after Volcanic Fissure I Stampede for "movement" while supplementing clear. You only have to use Stampede for a pack or two to get max charges, then use Ancestral Cry.
Support Gem Choices
My support gem choices should be pretty obvious and don't need too much explanation...but some notes.
Immolate is a great dmg multiplier for other skills that don't need to proc ignite. We only need Volcanic Fissure to Ignite, giving our bigger dmg spells a better multiplier.
Armour Explosion damage also scales with the support gems attached to Volcanic Fissure which is why we make sure to try to double dip support gems that give more multipliers to both.
Rageforged II as a Titan we are pretty much at max rage all the time. With Volcanic Fissure plus rage on hit from the tree we have massive rage generation allowing us to use Rageforged II with no downside.
DO NOT USE Rageforged II ON Volcanic Fissure AS EACH FISSURE PROC CONSUMES RAGE.
DAMAGE CONVERSION - does not work like POE 1 - skills like Forge Hammer and Volcanic Fissure don't really benefit from stuff like Heft or other similar support gems.
Other Skill Options
Earthshatter - It's good but after four Earthshatter character I prefer Rolling Slam which just feels better to me. You can still use Earthshatter if you want.
Earthquake is a lot of fun but requires reduced duration investment which goes against our build.
Sunder is another good option but I just prefer Earthshatter now. Even with sundered armour synergy the other slams feel better.
Instead of Stampede you can also use Leap Slam with or just 
Boneshatter as well.
Boneshatter especially is just an incredible skill that provides massive clear and dmg, especially if you like using 
Herald of Ash.
There are a LOT of skill combinations as well. If you like Shields and can 
Giant's Blood, 
Shield Wall can help clear as well.
Mace Strike is kind of meme for me, sometimes I use it to just get Behead II stacks but you don't have to use it.
0.4 Notes (refer to passive tree section too)
0.4 introduces "anti burst" bossing...so prepping bosses with a crit Earthshatter variant is a bit harder now but still doable. I still prefer Rolling Slam.
Ancestral Cry gets a dmg buff but "proc" nerf, really not a big deal at all tbh - you won't notice the nerf.
Boneshatter is massively BUFFED. This is big - they completed fixed Aftershock from Boneshatter with Impact Shockwave - as it previously wasn't working/scaling properly. This could really change how we clear / play the build...
A setup like Volcanic Fissure that focusing more on stun build and then Boneshatter for clear should be viable for sure. You can also just do the classic Leap Slam + Crater with Boneshatter and clear like that as well...it's all going to be personal preference.
Auras
Scavenged Plating is a must. (We are always breaking armour so 100% uptime!)
Herald of Ash 
Overwhelming Presence and 
Berserk are all good options. I loveHerald of Ash for some better clear but remember you need good overkill dmg to utilize Herald of Ash (like Boneshatter or great gear).
Cannibalism I and Herbalism I to round out Aura supports. Precision I works as well.
Warrior
Titan
Hulking Form especially just adds even more power with the passive tree rework, the aftershock chance combined with free Fist of War III (this works with 
