Fire BWC & Ravenous Earth Defiler

A Demolitionist thrown bomb, one of the two main damage skills, combined with its High Potency and Demon Fire modifiers. Bind the Magi devotion's Fissure proc here (triggers on attack).

A Demolitionist thrown bomb — the other main damage skill, converted to Fire damage once the Vilgazor's Heart amulet is equipped. Round it out with Ulzuin's Chosen.

A Necromancer AoE debuff attack, converted almost entirely to Fire damage by Blazeheart and Mark of Burning Shadows — an extra damage source. Bind the Solael's Witchblade devotion's Eldritch Fire proc here (15% chance on attack).

A Necromancer drain skill that item modifiers turn into a -35% Fire resistance reduction tool. Bind the Alladrah's Phoenix devotion's Phoenix Fire proc here (100% chance on crit).

A Demolitionist placed bomb — an additional resistance reduction source. Bind the Ulzuin's Torch devotion's Meteor Shower proc here (30% chance on attack).

An always-on Necromancer passive that substantially boosts health, backing up survivability from early leveling onward. Bind the Chariot of the Dead devotion's Wayward Soul proc here (20% chance on being hit).

An always-on Demolitionist passive that boosts Offensive Ability. Its Temper modifier also raises Defensive Ability. Bind the Behemoth devotion's Giant's Blood proc here (15% chance on being hit, boosting recovery/regeneration).

An always-on Demolitionist passive that boosts health regen and movement speed.

A Demolitionist defensive passive. Invest more heavily here for Hardcore.

• ▸Start as Demolitionist, investing in the mastery bar to unlock Blackwater Cocktail. Either put a few points in it, or go straight for the High Potency modifier (more damage at the cost of a cooldown). Add 1 point each in Flame Touched and Vindictive Flame, and push Cocktail to 12 points. Kyzoggs Skull is a solid early off-hand, and after level 5 you can slot a Searing Ember component into it to unlock Fireblast, which alone can carry you to Warden Krieg.
• ▸Invest in the Demolitionist mastery bar to unlock Demon Fire — get a couple of points in before Burrwitch Village, where the fire-resistant soldiers at the riftgate are otherwise a pain. Then unlock Necromancer and invest in Spectral Binding for a big health boost. Chase Slith Primal Ring and Shambler's Heart (amulet). After level 15, craft Flintcore Bolts to upgrade Fireblast.
• ▸Once Spectral Binding is maxed, focus on Demolitionist: unlock Thermite Mine, Blast Shield, and Agonizing Flames, and push the Blackwater Cocktail line to 12 points. Chase Martin's Crest (medal) and Incendiary Shoulderplates (not a guaranteed drop, but worth farming) in Cronley's Hideout.
• ▸Push Thermite Mine to around 13 points. Chase Zarthuzellan's Codex (50% drop rate) from the boss Zarthuzellan at the end of Steps of Torment. Check faction gear too, like Devils Chestguard from Devil's Crossing.
• ▸Push the Demolitionist mastery bar to 50 points and Necromancer to 25 (picking up Necromancer skills earlier is largely wasted without the gear to support them, so this can wait). Chase Ugdenbog Flamestrife (boosts Blackwater Cocktail damage) from Janaxia in Ugdenbog. Chase Vilgazor's Heart (this build's amulet through the late game, converting Grenado to Fire) from Vilgazor on floor 2 of Ancient Grove (skeleton key). After unlocking Steelcap District, buy the Conflagration relic blueprint from Hyram. From level 50 onward, Black Legion's Legion Greaves/Headguard are also options.

• ▸In Forgotten Gods, chase the Compelled Wraith off-hand (there are multiple variants — only the "Compelled" one works for this build), and invest in Siphon Souls once unlocked. Push the Cult of Solael to Revered (buy and craft the Mark of Burning Shadows blueprint at level 90, converting most of your Necromancer skills to Fire).
• ▸Chase the level 94 Fettan Mask from an urn near the Maw of Enat, close to the Korvan Sands riftgate. At level 94 you can equip Blazeheart (a reward from Dailas's quest chain).
• ▸Aim for Elite Coven Arcane Chestguard (chest), Bysmiel-Sect Legguards (pants, Dreeg-Sect Legguards also works), 2x Gollus' Ring, and a crafted Malmouth Arcane Girdle (belt).
• ▸If energy feels short, use 2x Solar Radiance augments on your weapon slots, or a Prismatic Diamond in your helmet.
• ▸Late-game, transitioning into the Blightlord set is an option — the playstyle stays largely the same, though you'll need to respec Grenado and Ulzuin's Chosen, and it frees up spare skill points you can put into Master of Death.

• ▸Keep throwing Blackwater Cocktail and Grenado while Thermite Mine and Siphon Souls whittle down enemy resistances.
• ▸Layer on extra damage with Ravenous Earth, and lean on Spectral Binding and Vindictive Flame to keep fighting.
• ▸Single-target damage is weak, so keeping enemies inside your AoE effects matters — expect to effectively facetank tougher enemies.
• ▸Projectile-heavy enemies (notably Rashalga the Mad Queen and Valdaran) are natural counters, since their retaliation effects can one-shot a projectile-based build like this.

This build runs tight on attribute points, so watch your gear and component choices from early on. Fill resistances steadily up to the cap (around 80%), and lean on Siphon Souls and Thermite Mine to cut enemy resistance and boost damage.

Single-target damage is weak, so solo boss fights drag on. Attribute points are tight, and gear requirements can force awkward choices. Survival leans on health regen and damage reduction rather than raw toughness. Bosses that punish projectiles with retaliation effects (Rashalga, Valdaran, etc.) are a poor matchup.

Farm Cronley's Hideout for the medal and shoulders, Zarthuzellan at the end of Steps of Torment for the off-hand, Janaxia in Ugdenbog for the weapon-boosting item, Vilgazor on floor 2 of Ancient Grove for the amulet, and the Maw of Enat near the Korvan Sands riftgate for the helm.