Sumona

Sumona is a non-player character found in the north of Pollnivneach, near the Magic carpet transport spot. Talk to Sumona to begin the Smoking Kills quest.

After players complete the quest, Sumona reveals herself to be the newest Slayer master. She also explains about the Slayer reward points obtained for each slayer assignment completed. She gives 12 points for each task, 60 points for every 10th task, and 180 for every 50th task completed.

Strangely, on the interface for NPC Contact, her skin is lighter and her hair is blonde.

Jesmona
Jesmona is supposed to be the twin sister of Sumona. However, after the Smoking Kills quest, players learn that there is no such person called Jesmona, and that Sumona and Jesmona are one and the same. This is revealed by Catolax in the Desert Slayer Dungeon, after the quest in the final cutscene. He further explains that Sumona and Jesmona are, in fact, a manifestation of Amascut, the Devourer. However, due to the fact that during the quest Amascut promised you a reward, she is forced to act as a new slayer master for you after the quest is complete. (It is also possible she is simply sending you on slayer assignments in further attempts to get you killed.)

Assignments
The following are all the possible assignments a player can receive from Sumona:

Trivia

 * When you ask Sumona "I have some questions about your sister and the smoky dungeons", Sumona responds at one point saying "Am I my sister's keeper?". This is referring to the Bible story of Cain and Abel, when Cain says "Am I my brother's keeper?" when God asks him where Abel had gone.
 * It is impossible to move the curtains (which act as the door) in her house, the message which appears while trying to do so says that a mystical force keeps them from moving, and Sumona gives a "knowing smirk".