The Spectral Elemental is a monster found only on the Console Version in the Underground Hallow. It is a special version of a Chaos Elemental with more HP, higher knockback resistance, and 50-60 attack. It also seems to be a slightly lighter hue than the Chaos Elemental and other illuminant creatures.
Compared to the Chaos Elemental, it has the same attack, higher HP, a slower movement speed and the ability to inflict the debuff 'Slow', making considerably more dangerous.
On mobile versions it rarely tends to drop a Rainbow Rod.
On the Mobile Edition, Spectral Elementals don't spawn in pure Underground Hallow, similar to how the Chaos Elemental doesn't spawn in pure Underground Hallow due to the same bug.