Pit Rarities

[PowerDiver]

Is there a reason dragon pits are so rare in comparison to undead pits? I would think there should be a more or less even balance between dragons and demons and undead.

Looking a bit, there are 7 kinds of dragon pits with rarity 6, so that makes the total comparison is just a bit more commone than rarity 1 IIUC.

The standard undead pit has rarity 1. However, the undead pit average depth 80 while the dragon pits are average depth 85, which surely makes undead pits more common.

Furthermore, there are lesser undead pits and vampire pits at much lower levels, each with rarity 1. Demons come in somewhere in the middle due to lesser demon pits.

Aside: While I was looking around, I noticed that the pits and nests declarations were each present 4 times in dungeon_profile.txt. Is that really intentional?

[edit] Should have noted playing version Angband-4.2.5-338-gdec118a25

[Nick]

The way dungeon_profile.txt works each generation type needs to include all the room types that appear, so there is a lot of repetition (classic, modified, moria and lair levels all have pits and nests, so that's where the four comes from).

Your calculations on rarity look reasonable to me, so there may be something subtle going on, perhaps with the fact that the undead ones are actually nests (so unordered), and maybe to do with the relative total number of pits and nests in pit.txt.

[PowerDiver]

Currently at DL78, and I have lost track of the number of undead pits/nests but seemed like at least a dozen, and have not seen a dragon pit all game. If I play another game, I'll change their depths to 70 or 75 and see if it makes a difference.