Harry/Cassandra
That is very true. Time is... Complicated. A tree with unlimited branches. Every choice we make creates a new timeline - from the smallest decision, to a castle ripping us out of place. That is why I prefer to keep my prophecies to myself as much as I can.
Divination does cause such rifts amongst the magical community...
Ah... The oracular herbs. A mixture of herbs that, when burned and the smoke inhaled, causes very serious hallucinations and perhaps a bit of a minor moment of insanity. But also opens the Inner Eye to the fullest. It's what they used in Delphi.