Sisdekal
Sisdekal is a manah. He enjoys manipulating others and causing their deaths.
He took a mission from Trianna to observe Jasmine and her companions.
When Crak and his pack failed to defeat the group, Sisdekal offered Crak a deal: extreme power for a limited time in order to attempt to kill the group.
SPOILER HERE:
Show spoiler
Attempting to kill the group - even indirectly - was a deliberate violation of Trianna's decree that they be given safe passage. As a result, Ignos killed Sisdekal.