Selenian

It comes with the Solar Pillar once the Lunatic Cultist is dead, so there is nothing to summon and no way to meet one early. It walks rather than flies, one of the few things at that pillar you can outrange on open ground, and it closes distance by lunging at you with both swords spinning.

While spinning it sends most projectiles straight back at you, which is the part everyone remembers. The half worth learning is that the same move leaves it taking triple damage from anything it cannot bounce. The attack that looks like a wall is your window. Reflected shots used to return at full strength and scale with difficulty, which made a wrong weapon lethal. They come back weakened now, so a bad pick is a lesson rather than a death.

• Bullets, arrows and darts all reflect, which covers most of a ranged loadout and is why this pillar punishes gunners hardest.
• Rockets pass through untouched, so a launcher such as the Snowman Cannon is the clean ranged answer.
• Most melee weapons you would carry this late are unaffected, so swinging into the spin is safe and lands inside the damage window.
• Minions deal contact damage rather than firing anything, so summoners can ignore the mechanic.
• Several magic weapons are immune too, the Magnet Sphere and Razorblade Typhoon among them.