Spirit of Purity

The Spirit of Purity (SoP) is a post Moon Lord boss. The first match is summoned by killing a bunny in front of a Elemental Purge and the rematch is summoned with the Ritual of Bunnies. Its rematch is considered one of the hardest modded bosses in Terraria.

Appearance
It looks like a green cloudy fog thing with 2 white dots for eyes.

First Match
The arena you fight it in will allow you to teleport to the other side of the arena when touched, however, it gives you a debuff called Undead for a few seconds which makes healing hurt you. You have 3 lives when you spawn the boss in, dying from it thrice will instantly kill you. When spawned in. it will have 10 circle things surrounding it which can harm you, as it loses health another ring of the same circles surround but disappear when Sop takes further damage. Its first attack is to surround the place with doors that open up with SoP's face in it after a few seconds, touching the door when it's open will damage you. It will then summon in vertical laser spread across the screen that grows bigger before disappearing. It will then send some green balloon-esque eyes which are directed at the player and fly around where the player was before charging in and disappearing. As the SoP loses more health, there will be more eyes. It will then send some lasers at the player. It also sends large black lasers that stretch the length of the arena and goes along both vertically and horizontally and the player must go to one edge of the arena to teleport past it. If the player drinks a potion in the battle, they won't be able to use another for the rest of the battle. To prevent cheating, only vanilla weapons can deal full damage to SoP. As it loses health, it will create a Shield of Purity that makes it invulnerable until the shield is destroyed. It will also send in a large green cloud that chases after the player and the player must either teleport to the other side of the arena to avoid it or outrun it long enough until it disappears.