They can only hover about eight blocks off the ground.
Both the Ice Elementals and their projectiles emit a high amount of light.
Frost Blasts cannot be destroyed by hitting them, unlike many other orb projectiles.
Frost Blasts cannot travel through walls.
Ice Elementals ignore the Shroomite/Vortex armor's set bonus and they can still fire at stealthly/invisible players.
Although Ice Elementals have a high range, their projectiles travel slowly enough to dodge them.
Elementals are magical entities who embody/personify a force of nature. Historically, elementals personify one of the four Classical elements: earth, water, air or fire (sometimes plant, but never Aether). Dungeons & Dragons introduced elementals that were fusions, and other unconventional elementals.
Unlike most ice-themed enemies, the Ice Elemental can neither inflict the Chilled nor the Frozen debuffs. They instead inflict the Frostburn debuff.
Ice Elemental is the only enemy in the game to inflict Frostburn.
The Bestiary entry for the Ice Elemental: "Water elementals become icy when dense strong magicks accumulate in the coldest places. Their frosty shards freeze all."