Ranks
Rank 1
You can force a target NPC at or below your level to attack their allies for a limited time.
Rank 2
You can force a target NPC up to 10 levels higher than you to attack their allies for a limited time.
Rank 3
You can force a target NPC up to 20 levels higher than you to attack their allies for a limited time.
Rank 4
Enemies affected by Instigation will attack their allies until they are dead.
Challenges
Rank 1: Successfully Instigate 5 different people.
Rank 2: Successfully Instigate 25 different people.
Rank 3: Successfully Instigate 50 different people.