Harmony Island was once a peaceful island full of monks, yet now it is ridden by zombie pirates, and the monks have become undead. The island is south of Mos Le'Harmless and only accessed during and after The Great Brain Robbery by selecting the transport option at Brother Tranquility, who is located at the docks of Mos Le'Harmless.
The island contains a Farming allotment patch and a mill. Unlike other allotment patches this one has no farmer to watch your crops for you. After completing the Elite Morytania Diary, a herb patch becomes available.
This island is covered in a strange green poisonous gas after a certain point in the quest. To travel outside, you will need your fishbowl helmet and diving apparatus. After finishing the quest, the gas disappears.
Although it is run by monks and has its own chapel, this island does not have a Prayer altar.