Slime Hunter is a title awarded by completing the Pursuit quest and using the quest reward A Certificate Of Capture. It appeared with Publish 57 in December 2008 as part of the Slime Invasion event, both of which had a duration of 7 weeks before ending.
Once the title was claimed, a character could display, hide or switch to another title they have earned by opening a Contextual Menu on their character and selecting the "Select Reward Title" option.
Only characters who have completed the Pursuit quest may display the Slime Hunter title. A character attempting to use the certificate that has not completed the quest will be given a message indicating they have not earned the right to have the title.
The title appears in the Item Properties display when a character is targetted and not in their Paperdoll.