Vortexian

Type	Enemy
Environment	Lunar Events
AI Type	Fighter AI
Damage	90/180/270 (contact); 100200300 (Vortex Lightning)
Max Life	700/1400/2100
Defense	34
KB Resist	40%/46%/52%
Banner	Vortexian Banner(Desktop, Console and Mobile versions)
Immune to
Hurt	https://terraria.wiki.gg/wiki/File:NPC_Hit_1.wav
Killed	https://terraria.wiki.gg/wiki/File:NPC_Killed_5.wav
Summon Vortex	https://terraria.wiki.gg/wiki/File:Item_113.wav

Desktop/Console/Mobile-Only Content: This information applies only to the Desktop, Console, and Mobile versions of Terraria.

The Vortexian is a Hardmode, post-Lunatic Cultist enemy that spawns in the area of the Vortex Pillar during the Lunar Events. Upon death, a portal is summoned that shoots a lightning bolt aimed at the player, indicated by a glowing line, similar to one of the attacks of the Lunatic Cultist and the lightning portal of the Vortex Pillar. They are powerful in packs, and can potentially start an overwhelming lightning chain reaction if not dealt with properly.

Trivia

The Vortexian, Selenian, Predictor, and Stargazer all share very similar sprites.
They seem to resemble the Moon Lord with legs but without the eyes or the spine. The teardrop design on its chest, combined with the exposed brain further supports this.

The Bestiary entry for the Vortexian: "The cosmic energy surging through these warriors builds up until their untimely demise, resulting in an explosion of lightning."