Buy RS3 Rock-shell armour set
The Rock-shell armour set is a Fremennik power armour set for melee players in RuneScape 3. It is a members item and needs level 50 Defence to wear. The set has five pieces: the helm, plate, legs, gloves, and boots. Together the pieces give a total of 548.9 armour and 62.4 prayer bonus.
Most of the set can only be worn after finishing The Fremennik Trials quest. When a player wears the helm, plate, and legs, the locals add the title "Rockcrusher" to the player's Fremennik name. Wearing the set also counts toward the Dress to Impress achievement.
Getting this armour on your own takes work. The raw parts drop from Giant rock crabs, and Skulgrimen in Rellekka charges a fee plus dagannoth hides to craft each piece. Buying the full set skips all of that grinding.
The set can be stored in the armour case in the costume room of a player-owned house, but only as a complete set of five. It can also be kept as a single Grand Exchange set item to save bank space. The set is tradeable and noteable.