Indigo Flame is a substance found throughout the Destroy the Godmodder series. It can be created at will by Bill Cipher in his normal form, and was initially given to TheLordErelye by Bill in Limbo. Indigo Flame lets the user manipulate the minds of others, and can even let them enter mindscapes. Indigo Flame appears to be particularly volatile in mindscapes, and it can be alchemized to create objects capable of seeing/reading minds and entering them.
Mentally weak beings, such as Godmodder Soul, are very susceptible to the powers of Indigo Flame.