Cyenzak’s Brainworm

Cyenzak’s Brainworm is a spell that creates a parasite into the target’s mind. The effects are of follow

Stages 1 and 2: No symptoms. It can be detected at Stage 2. 

At Stage 3, the target’s mind slowly deteriorates, starting to act oddly. 

Stage 4 is when the target gets Paranoia and Delusions. They start to perform unexplained acts of physical violence, ending up murdering someone or committing suicide. 

At Stage 5, the victim starts clawing at their flesh due to delusions of insects crawling under their skin. Severe cases leads to death as the victim destroys their throat. Either that or extreme paranoia induced psychosis. Your choice.

10 days is just the minimum amount of days for the target to  reach Stage 3.