Crack the earth open with Fissure, layer Firestorm and Armageddon on top, and watch entire packs go up in flames. The best AoE Leveling build in Diablo 2 Resurrected, scaling all the way to a Sunder Charm-powered Max GG farmer.
The Fissure Druid (Fire Druid) is one of D2R's most explosive AoE builds - the denser the pack, the harder it hits. Fully geared, it remains one of the most satisfying clear-speed setups in the game, with the usual caveat: one element and careful positioning.
Fissure cracks the ground for massive AoE; Firestorm covers singles; Armageddon rains Fire continuously. Molten Boulder and Volcano bridge Fissure cooldowns and deal Physical vs Fire Immunes before Flame Rift.
Ravenlore and Flickering Flame stack -% Enemy Fire Resistance; Phoenix adds Redemption Mana and Merc damage. Flame Rift drops Fire Immunes to 95% Resistance; an Infinity Might Mercenary's Conviction finishes the shred. Facet-socketed swap CS pushes -Enemy Fire Res further vs tough Elites.
Best farms: Secret Cow Level, Flayer Jungle, Stony Tomb, and Tal Rasha's Tombs - anywhere density lets Fissure compound across the pack.