balrog (flux's fork)
fluxionary

adds balrogs.

mime (flux's fork)
fluxionary

adds a monster mimicking its surrounding nodes.

Power Rangers Modpack
LC Creations

Adds power rangers and an API to create your own.

Epic Combat
hilol

Fight your enemies with various weapons and protect yourself with distinct sets of Armour, whilst sharpening your skills in PVP and PVE.

PaleoTest for Hades Revisited
SFENCE

Adds Not Only Prehistoric Fauna and Flora to Hades Revisited.

pilzmod
Phii

a spreading mushroom biome which you can spawn into the world, with its own monsters and a boss you need to slay to stop the biome's growth. Best played with bow & armor mod and after reading manual.