Blue Mist Warning

If adventuring out in the forest, keep eyes open for a blue tinged mist as it spreads a fever which send people insane .

The mist appears as blue/purple vapour and seemingly tracks those close to it, suggesting some level of sentience?

Kailyn discovered that the lesser restoration spell is capable of dispelling the effects of the mist. Suggesting that the mist spreads some kind of disease of the mind