/usr/share/crawl/dat/des/guide.txt is in crawl-common 2:0.19.3-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | Guide to des files
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des files are mostly used for creating parts of maps. Typical examples are
arrival vaults or most branch ends. They are organised into several
subdirectories of dat/des, namely
branches = maps special to a branch, and branch ends
portals = maps needed for portal vaults like labyrinths or bazaars
arrival = Dungeon arrival vaults
variable = floating vaults, minivaults
altar = overflow and other altars
serial = for serial vaults (a chain of small vaults to be used on one level)
traps = lua defined trap vaults
builder = layouts and other vaults placed specially during level-building
(shops, uniques, etc.)
sprint = maps for the Dungeon Sprint minigame
tutorial = maps for the tutorial minigame
test = vaults used for testing the game
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