The following monsters are located within the Underground Hallow biome.
“The Hallowed Mimic is a miniboss that spawns rarely in the Underground Hallow. They can also be...Hallowed Mimic
“The Illuminant Slime is a monster that appears only in the Underground Hallow after enabling...Illuminant Slime
“The Spectral Elemental is a monster found only on the Console Version in the Underground Hallow...Spectral Elemental
“For the weaker variant, see Gastropod The Spectral Gastropod, is a console-exclusive variation...Spectral Gastropod