Nether Lava
bigglobe:underground_pockets/nether_lava
Biomes
Nether Lava generates in these biomes and biome tags:
#bigglobe:has_structure/underground_pocket/nether_lavaPlacement
Nether Lava: the world places one attempt in every 6×6-chunk region, at least 3 chunks apart; it shares its placement set with other structures (weight 100).