Diagnostic Spell

The Diagnostic Spell is a spell that can be used in order to find out the cause of a supernatural illness.

Season 14
When Sam calls out Rowena MacLeod to help understand what is wrong with Jack, she uses this spell in order to discover what was happening to the nephilim.

Procedure
The caster must recite a Latin invocation over target's body, repeating the phrase:

Possim rei huius cognoscere causas. (roughly means "tell me the cause of this")

The spell allowed Rowena to learn that Jack's Nephilim nature as a half-human, half-angel is unable to sustain his body without his grace.

Appearances

 * Season 14
 * Unhuman Nature  (mentioned only)