Sound Credits:

Hydra Slayer sounds, by Brett Cornwall, under CC BY-SA 4.0
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[ https://creativecommons.org/licenses/by-sa/4.0/ ]

seen-eagle (hydras/hydra-vulture)
seen-sandworm (hydras/hydra-ancient)
seen-snake (hydras/hydra-arch)
seen-dragon (hydras/hydra-dragon)
seen-skeleton (elements/bone)
seen-air (other/broomOfSpeed)
seen-earth (other/wallcrush)

die-vinebeast (hydras/hydra-ivy)
die-vinespirit (elements/ash)
die-troll (weapons/stone)
die-bomberbird (potion/potion-decapitation)

hit-sword1 (weapons/swordAttack-small)
hit-sword2 (weapons/swordAttack-medium)
hit-sword3 (weapons/swordAttack-heavy)
hit-axe1 (weapons/axeAttack-light)
hit-axe2 (weapons/axeAttack-medium)
hit-axe3 (weapons/axeAttack-heavy)
hit-crush1 (weapons/mushroomCrush-1)
hit-crush2 (weapons/mushroomCrush-2)
hit-crush3 (weapons/mushroomCrush-3)
hit-rose (weapons/spearAttack-small)

pickup-gold (elements/silver)
pickup-winter (elements/frozen)
pickup-potion (other/pickup-potion)
pickup-scroll (other/pickup-scroll)
pickup-gem (other/pickup-powder)
pickup-speed (potion/potion-extreme-speed)
pickup-discord (potion/potion-conflict)
pickup-orb (potion/potion-weaponcharge)
pickup-key (weapons/switchToSword)
pickup-yendor (weapons/switchToShuriken)

orb-teleport (other/teleport)
orb-mind (other/stealsYourWeapon)
orb-ranged (other/fingernailGrows)

tada (other/tada)
necromancy (potion/powder-fungalNecromancy)
fire (elements/fire)
storm (elements/storm)

By Zeno Rogue, under CC BY-SA 4.0:
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seen-wolf (woof)

from Freesounds, Public Domain sounds:
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[ https://creativecommons.org/publicdomain/zero/1.0/ ]

seen-troll: https://www.freesound.org/people/Rocotilos/sounds/341489/
seen-kraken: https://www.freesound.org/people/Kirat/sounds/158687/
explosion: https://www.freesound.org/people/rendensh/sounds/105413/
orb-frog: https://www.freesound.org/people/jeremysykes/sounds/344501/
mousesqueak: https://www.freesound.org/people/AntumDeluge/sounds/188043/ (modified)
click: https://www.freesound.org/people/KorgMS2000B/sounds/54406/
pickup-mirror: https://www.freesound.org/people/wjl/sounds/267889/
message-roar: https://www.freesound.org/people/JoelAudio/sounds/85568/
opengate: https://www.freesound.org/people/Qat/sounds/107640/
steamhiss: http://freesound.org/people/toiletrolltube/sounds/181488/
frog1: https://freesound.org/people/AntumDeluge/sounds/417822/ [mutant-frog-2]
frog2: https://freesound.org/people/AntumDeluge/sounds/417821/ [mutant-frog-1]
frog3: https://freesound.org/people/katzlbt/sounds/361117/
elementalgem: https://freesound.org/people/Varnsworth/sounds/425165/
die-kraken: https://freesound.org/people/cylon8472/sounds/341173/

from Freesounds, under the CC BY 3.0 license: 
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[ https://creativecommons.org/licenses/by/3.0/ ]

trapdoor: https://www.freesound.org/people/Jagadamba/sounds/258061/
nervous: https://www.freesound.org/people/pfranzen/sounds/273720/
splash2: https://www.freesound.org/people/Kayyy/sounds/61015/
splash1: https://www.freesound.org/people/eddybennet/sounds/226381/
seen-water: https://www.freesound.org/people/soundscalpel.com/sounds/110393/
seen-ghost: https://www.freesound.org/people/ditroiamusic/sounds/180022/
closegate: https://www.freesound.org/people/JavierZumer/sounds/257233/
message-troll: https://www.freesound.org/people/daalvinz/sounds/364216/
hit-orbsword: https://www.freesound.org/people/Vicces1212/sounds/123765/
bull: https://www.freesound.org/people/confusion_music/sounds/103425/
apple: https://freesound.org/people/jgriffie919/sounds/400174/
levelup: https://freesound.org/people/InspectorJ/sounds/411460/

recorded by Tehora Rogue, under the CC BY 4.0 license:
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[ https://creativecommons.org/licenses/by-sa/4.0/ ]

die-princess
dzia-princess
heal-princess
hit-princess
die-fairy
seen-fairy
seen-rosebeauty
speak-princess

recorded by Zeno Rogue, under the CC BY 4.0 license:
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[ https://creativecommons.org/licenses/by-sa/4.0/ ]

die-prince
dzia-prince
heal-prince
hit-prince
seen-gardener
seen-necromancer
seen-vizier
speak-prince

recorded by KosGD, under the CC BY 4.0 license:
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[ https://creativecommons.org/licenses/by-sa/4.0/ ]

seen-cultist
seen-cultistfire
seen-cultistleader

Sounds yet missing, might be added soon:
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seen-avenger
die-kraken
die-dragon
hit-vampire
falldeath
burndeath
orb-safety
