Gensokyo/Pure Fury

Pure Fury is a Hardmode, post-Lunatic Cultist magic weapon. It creates a circle consisting of 30 projectiles and expanding around the player. After roughly a second, the circle stops expanding and begins contracting instead. The projectiles that make up the circle can pierce an arbitrary amount of enemies, and do not collide with tiles.

The Pure Fury spell tome is available for purchase at the Curio Trader after defeating all Tier 6 Bosses, or any Tier 7 Boss.

Trivia

 * Pure Fury is a reference to Junko, as many of her attacks consist of simple circular patterns. In addition, the name of the item references the name of Junko's theme, Pure Furies ~ Whereabouts of the Heart.