I have read where a select group of sorcerers have sent warnings before rendering a hex or curse. Many accounts both fiction and non-fiction details revenge with messsges of intent to there victims.
Anything from painting a pentagram on the intendeds door to letters with personalized sigils in blood. One account lists sending a slain cows heart with a nail driven through it to a person they thought had transgressed.
Opinions, has anyone proceeded with an occult warning or is the hex or curse warning enough.