How mob drops are wired

Each NPC carries NpcDrop rows whose difficulty columns point at DropBase tables; those point at DropEntity rows whose per-class columns name the items. We chain all of it: 93.8% of drop-table references resolve, giving 3,585 NPCs named drop lists on their pages (see any boss under the NPC database — 'Known drops').

What no client can tell you: the actual roll — weights-to-percentages need a base-rate table that doesn't ship, and the roll itself is server-side. Chase the named chains yourself in the drop explorer.