Whoever made this Depths vault is a devious bastard

[ThreeInvisibleDucks]

I almost lost my FeTm to it, so thank you for the challenge whoever made this thing.

https://imgur.com/onzBB0S

[Arrhythmia]

this is the river lethe and it's been around for ages. it was made by lemuel, and used to have a guaranteed potion of XP but i think they got rid of that

[4Hooves2Appendages]

What's so dangerous about it?

[Sprucery]

  Code:

###############################################################################
# The River Lethe
#
# The two orange statues are placed for maximum pain -- one you're likely to
# first see while flying, the other aided by a giant eyeball and protective
# plants.
#
# Lemuel
#
NAME:    lemuel_river_lethe
TAGS:    no_rotate no_monster_gen no_item_gen uniq_d_encompass
ORIENT:  encompass
MONS:    plant / fungus w:2
MONS:    wolf / warg / hell hound / raiju w:4
MONS:    shadow w:20 / wraith w:20 / lost soul w:2 / \
         shadow wraith / phantasmal warrior / skeletal warrior
MONS:    dancing weapon / war gargoyle w:2
MONS:    spectral spriggan / spectral centaur / spectral naga / \
         spectral merfolk / spectral ogre / spectral troll / \
         spectral minotaur w:1 / spriggan simulacrum w:2 / centaur simulacrum w:1 / \
         naga simulacrum w:2 / troll simulacrum w:2 / minotaur simulacrum w:1 / \
         merfolk simulacrum w:2 / vampire / wraith / wight
MONS:    mana viper / eidolon w:5 / soul eater w:5 / \
         death drake w:5 / flayed ghost / shadow dragon w:2
MONS:    ancient lich w:20 / tzitzimitl
KMONS:   8 = Maud, patrolling giant orange brain
KMONS:   9 = patrolling giant orange brain
KMONS:   0 = orange crystal statue
KMONS:   B = giant eyeball
KMONS:   C = 0 band
KMONS:   W = patrolling water elemental w:40 / \
             patrolling hydra simulacrum / patrolling hydra spectre / \
             patrolling anaconda simulacrum / patrolling anaconda spectre / \
             patrolling snapping turtle zombie
ITEM:    any scroll
KITEM:   e = any / any good_item w:4
KITEM:   8B = potion of experience ident:type q:1 / any good_item
KITEM:   9 = |
KITEM:   0 = potion of brilliance ident:type
KFEAT:   8e = >
KFEAT:   W = w
NSUBST:  h = 1:+ / *:x, H = 1:+ / *:x
SHUFFLE: dD/eE/fF/gG
SUBST:   D = +, EFG = x
NSUBST:  e = 1:e / 1:* / *:%, f = 1:e / *:%, g = 1:e / *:%
SUBST:   | = |*
SHUFFLE: 0A
SUBST:   A = xw, 1 = 11.
# (previously) 762 ;, 372 ., SUBST: . = .:101 5:4, ; = .:201 1:3
NSUBST:  . = 12:5 / 2:. / 4 = 5. / *:., ; = 9:3 / 2:. / 4 = 3. / *:.
NSUBST:  . = 13:C / 4 = C. / *:., w = 6:W / 4 = Ww / *:w
MARKER:  O = lua:props_marker { portal=1 }
MAP
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ENDMAP

I'm not very familiar with the des syntax but I assume it can still have a potion of experience.

[PleasingFungus]

Only a 17% chance of getting one, though. (0.8% chance of getting two!)

[Eyesburn]

it is good map because you have downstairs next to upstairs, just go down and skip the floor