Flag of Purity

The Flag of Purity is a late War Mode item and one of the last things craftable before fighting the Phantom. The item mainly serves to represent War Mode coming to an end and serves to help make Phantom preparations far easier.

Effects
The Flag of Purity makes all enemies linked to a flag act towards you as if you had chosen their sides at the beginning of War Mode, meaning that they'll attack things that attack you. As such, the Corruption, Crimson, Hallow, and Confection become safe for the player, and that the player can easily build up an army of enemies for their protection and for the Phantom fight.

Crafting
At: Mystic Manipulator
 * Respective flag (1)
 * 50 Souls of Bright
 * 100 Souls of Night
 * 100 Souls of Light
 * 50 of the respective evil biome stone block.
 * 50 of the respective light biome stone block.
 * 50 Souls of Fight.

Trivia

 * Many people use this flag to form massive armies of enemies to aid in the Phantom fight alongside making it easier to set up the Phantom arena.