Hatius Cosaintus is located just outside of the Lumbridge Castle. He awards players the Explorer's ring for completing easy, medium, hard and elite tasks of the Lumbridge Diary.
- His name is a pun based on the phrase, "Hate us cause they ain't us", due to the fact he is wearing very rare and highly coveted equipment.
- Hatius Cosaintus appears to be wearing the Rune cane, Briefcase, 3rd age platebody, 3rd age platelegs, 3rd age cloak, Ranger boots, Top hat & monocle and the Amulet of fury (or), which has an approximate value of 331,422,295
- His out of place and unrealistic appearance has been criticized by players which led to the proposal to have him removed in Old School Content Poll #50: Models, Anims and More. However, with only 73.4% voting 'Yes', it failed the poll.