Yes, this mod does exactly what you think it does. Anything that had a death sound is now Wilhelm, because you can't have too much Wilhelm. This strangely includes Chorus Flower for some reason...
Supported Mobs:
- Allay
- Axolotl
- Bat
- Bee
- Blaze
- Cat
- Creeper
- Dolphin
- Donkey
- Drowned
- Ender Dragon (This one is hilarious btw)
- Endermen
- Evoker
- Fox
- Frog
- Ghast
- Glow Squid
- Goat
- Hoglin
- Horse
- Husk
- Illusioner
- Iron Golem
- Llama
- Panda
- Parrot
- Phantom
- Pig
- Piglins
- Pillager
- Polar Bear
- Ravager
- Shulker
- Skeleton
- Snowman
- Spider
- Squid
- Stray
- Strider
- Tadpole
- Turtle
- Vex
- Villagers
- Vindicator
- Warden (also hilarious)
- Witch
- Wither
- Wither Skeleton
- Wolf
- Zoglin
- Zombie
- Zombie Villager
- Zombie Pigmen
- Even the zombie/skeleton horses
Cows don't have a death sound...why Mojang >:| (also of all the fish, only Puffer Fish has a dedicated death sound lol)
Should work for all versions of Minecraft, tested in 1.12.2 and 1.19.3