Just to add:
Most rare spawns and rare item seem to be combination of 1/6 and 1/10 in dungeons
Those infamous Terrorantula, Rahotep, Dunedigger, Silverclaw, Flotsam, Jetsam, Timbur the Tiny, Bilge Farfathom, Cracktusk, Nightmare (lavastorm) etc all seem to follow 1/6, 1/10, 1/30 spawn rate off one, or multiple patrol npcs, just that some seem especially rare because either the zone is rarely touched, or is killed by other npc shortly after spawn, or relativity of drops (like no one really wants anything from Cracktusk)
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