This article pertains to content which exists in the code of Terraria, but is inaccessible through normal means.
What this means is that the topic of this article can only be seen through the use of third-party tools. It may or may not be available legitimately at any point in the future.
The White Cultist Fighter Banner is a banner dropped after every 50th kill of a White Cultist Fighter. It is displayed in the background, similar to paintings, only hung from the ceiling instead. Each banner gives a small bonus to defense from and damage towards the creature it is designed after.