Selenian

Type	Enemy
Environment	Lunar Events
AI Type	Fighter AI
Damage	90/180/270
Max Life	800/1600/2400
Defense	30
KB Resist	60%/64%/68%
Banner	Selenian Banner
Immune to
Hurt	https://terraria.wiki.gg/wiki/File:NPC_Hit_1.wav
Killed	https://terraria.wiki.gg/wiki/File:NPC_Killed_1.wav
Reflect projectile	https://terraria.wiki.gg/wiki/File:Item_150.wav

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

The Selenian is a Hardmode, post-Lunatic Cultist enemy that is spawns in Solar Pillar area during the Lunar Events. It is a ground-based enemy that wields two flaming swords. It has a spinning attack that causes it to move faster and reflect the player's projectiles.

It can reflect bullets, arrows, and darts, but not rockets, and the projectiles of numerous other weapons. For the complete list, see List of reflected projectiles.

Notes

Selenians take triple damage (after having calculated defense) when spinning.

Tips

Melee users should not have too much trouble with this enemy since most melee weapons available at this point cannot be reflected. Ranged users should use weapons that fire rockets such as the Snowman Cannon. Many useful magic weapons cannot be reflected, such as the Razorblade Typhoon, the Rainbow Gun, and the Magnet Sphere. Summoners also have an advantage as most minions deal contact damage without firing projectiles.

Trivia

the Selenian, Stargazer, Predictor and Vortexian all share very similar sprites.
The word selenian means pertaining to the moon and refers to Selene, the Greek goddess of the moon and sister of the sun-god Helios.

The Bestiary entry for the Selenian: "These acrobatic celestial warriors can deflect incoming threats whilst spinning with their solar-infused blades."