story/RP idea
The kings child was falsely accused of insanity and was arrested, being sent to maximum security prison. Presumably to rot in there for all of eternity, it was fine to the king as they had another heir when the king passes. The king does pass after a long amount of years, during that time the falsely accused heir had actually gone insane but was released by their unknowing sibling. The now freed heir started to hear voices and see spirits.
A spirit took advantage of their insanity, teaching them to hide it and pretend to be sane while convincing them to murder their sibling and take their rightful thrown
The insane heir succeeds in hiding their insanity, though the voices tell them to retake what was theirs, a small part of them doesn't want to murder their sibling
It's a battle between the voices and the insane heir's will to not kill their sibling
It's a battle between the voices and the insane heir's will to not kill their sibling
And their will is slipping