Made by Skulgrimen who is the helmet store owner in Rellekka; Dagannoth Rex
Notes:
To make this item you will need to have 2 dagannoth hides, 1 rockshell splinter, and 7500 coins. To wear this item you will need to have 40 defense and must have finished the the Fremennik Trials quest. It gives the same defense bonus as Rune legs.