Take the Eastern Catacombs portal and take the Northwest tunnel, you'll come to a large room and the portal to Swamp Cavern is on the south side.
You have killed 25 Putrid Moars! Your task is complete! Putrid Moar is incinerated by your assault!
Tibik tells you, "Excellent! Tibik be sneaky now. Gather food for Kor-Gursha. Tibik reward strong hunter now." Tibik declares you a hunter of Moar, and you receive the "Moar Hunter" Title. You've earned 5,000,000 experience.
Tibik tells you, "Less Moar now. Gathering easier. Thank you. If more Moar later, I ask you help again." Tibik lets out a guttural croak.