Dagon'hai set price rose exponentially during the weeks following its release, later the price crashed and eventually recovered to be around 50% of its highest point.
Although the Dagon'hai are followers of Zamorak, the robes do not count as Zamorak items in the God Wars Dungeon. However, they do count as Zamorak items in the Desert Bandit Camp, and cause the bandits to be aggressive toward the player.
In the Magic section of the Defence skill guide, a bug used to be seen while checking the requirements to wear Dagon'Hai robe bottom and top. The guide stated the requirements were "20 Defencewith with 40 Magic," the bug being the 'with'. This error has been fixed.
There is a glitch with the Dagon'Hai robe bottom on high detail where the bottom shows through part of the cape. This error has not been fixed.