So, all this is what they wanted Watcher to be. Oh man...
-New Surface threat theme only appears in Tundra Fault
-Pillar Grove lacks 1.5 creatures, but has more release-day ones
-Signal Spires has diurnal strawberry lizards, and different spawns at night

-Made a couple regions easier if Monk is warp-menued into them.
-Put some Strawberry Lizards in Aether Ridge & The Surface, if Blue Lizards cannot survive in those spots for some reason.
-Thermal Relay warps you deeper up in Salination.
-Removed the Ridgeworks torch from Cold Storage
-Tweaked Rift Regions Rework spawns, namely restoring Torrid Desert centipedes' aposematic color, altering some lineages for proper trophic shifting, and making the dustier Coral Caves have different intro music
-Deep Reef is listed as a subregion

Allowed Yellow Lizards in Less Caramels Blanching Wastes, patched some smaller non-lizards from that version of late Farm Arrays

-Light reworks on some Watcher regions. Put some King Vultures in Badlands, Shrouded Coast, and Signal Spires; put "red" enemies in Torrid Desert; prevented Black Lizards and Leapzards from being lineaged from thin air in Desolate Tract; put a tad more Greens and a Caramel in Rusted Wrecks' beach; replaced Blue Lizards with a couple White ones in Badlands; added Black Lizards to Turbulent Pump and Salination; prevented Leviathan from getting stuck to a pump; put Noodleflies and Wolf Spiders in Aether Ridge; put a Mother Spider in Shattered Terrace; reduced eel lizards in Fetid Glen's piping; removed herobrine; added some coil-rigging Elite Scavs to The Surface; removed Eggbugs from Verdant Waterways and made the leeches green; reduced scav blindfolds in the muddy city of Outer Rim; removed timer from Unfortunate Evolution; and tweaked spawns in rotted regions.
-Tweaked Less Caramel replacements again, as well as Saint Outer Expanse
-Made earlier Desolate Canal green as normal, with some darker palettes to mask hue changes a bit (palette 10 = you are in the DARK ZONE.)

Tried to stop this issue where official arenas can't show modified settings for some reason (for the love of god I don't remember doing anything else with this except making fading expanse non-story for a vista point can't appear in an inaccessible room why is it hard for me to talk to peeps)

(i'm real glad fading expanse updated at last)

(i like that it's still bright outside there)

Tweaked the aforementioned lineages to be more consistent

Allowed Scavenger numbers for the new version of Pilgrims' Ascent to be reduced.

-Added Safari icons for Aqueducts and Forlorn Valley
-Properly-sized thumbnails for Secluded Pass arenas
-Present-GW palette restored for Challenge 46
-Removed most threat layers from The Surface and Shattered Terrace
-New Ultrakill subtitles for Silent Construct, Spearmaster's Acerbic Station, Rotten City, and Fading Expanse (some reordering for Metropolis and Five Pebbles)
-Spearmaster Safari and removed "Garden" track for Lunar Aerie
-Updated Submerged Superstructure-Lunar Aerie passage to be somewhat easier to pass
-Removed a couple pre-Rivulet Lunar Aerie Blue Fruit from where the Monster Kelp would touch
-Forced normal MS_MEM06 and slightly-bluish MS_FARSIDE, overriding a merging mod
-Saint Safari for Forlorn Valley
-Metropolis Safari invariably allows Survivor, Monk, and Rivulet
-Normal names restored for Rivulet's Industrial Complex and Pipeyard
-New palettes for Grid, Thrones, Islands, and Dark Tower arenas
-Edits of music triggers for legacy Aether Ridge
-Changed unlock token worldstates: Bubble Weed for Monk, Survivor, and Gourmand; Brother Long Legs not for Artificer; Eel Lizard for Monk or Rivulet; no Salamander in Undergrowth; no Yellow Lizard in Infected Underhang
-Patched spawns for Gilded Sanctuary
-Non-DLC scugs for Purple Swamplands Safari (dunno why that place's so nostalgic to me)
-Placed some Wolf Spiders in mid-timeline Leg, and Survivor's spawns for Gourmand's Leg-Underhang intersection
-Some fairly threatening creatures can be lineaged easier in Outskirts
-Improved some Yellow Lizard lineages in "Citadel"
-Replaced a Miros Vulture with a Vulture in Glacial Wasteland
-Fixes to Less Caramels spawns: Monk's Chimney Canopy and Garbage Wastes have Greens replace smaller lizards, fixed precycle spawns for Desolate Fields, separated late-Outskirts Dropwig spawns

-Better palettes for Grid, Acid Fields, Islands, and Array's Challenge version
-Compatibility with Timeline World Corrections' Submerged Superstructure ("Random Fate" appears for Saint's worldstate)
-Rivulet's MS_FARSIDE has very light rain and has bluish water to fit the wet season
-Lizard Customizer folder has Caramel Lizards be a tad less obese and lunge horizontally
-Reduced Dropwigs in hardmode Outskirts and Drainage System
-Tweaked Farm Arrays so Gourmand has another Blue Lizard, and Desolate Fields feels a bit more empty
-Moved a herd of Yellow Lizards from Rivulet's Chimney Canopy to Saint's
-Put one Vulture and one Leviathan in Gourmand's Shoreline
-Allowed an Elite Scavenger to appear in Artificer's Industrial Complex and Acerbic Station
-Fixed a Sunlit Port track
-Removed the trigger from Glacial Wastelands' passage near Pilgrim's Ascent
-Added rounded Pilgrim's Ascent Safari icon, and better menu background panning
-Edited Hunter's description to hide the fact that its days are numbered
-Fixed a Pilgrim's Ascent room near Acerbic Station
-Fixed up Scorched District's map so Distillation Column is a Spearmaster-only name
-Rotten City now lacks a rain timer
-Fixed up Shoreline's "Gate to the Shoreline" trigger from Shaded Citadel
-Added nighttime wall lizards and a white lizard to Pilgrim's Ascent
-Patched up Ashen Monolith properties to be sure that the Eel Lizard stays underground

Fixed up the Fading Expanse threat music, and the introduction popups appearing early in the Humid Fields.