Module: AtlasLootClassic_DungeonsAndRaids
Category: Items
Loottable: [SOD_DIFF][Onyxia2][Onyxia]
Items: { 1, 18423 }, -- Head of Onyxia

Additional context
In file data.lua, line 7888, the itemId 18423 for Head of Onyxia is incorrect for the SoD version. It should be 228688