A crystal throne can be built in the throne space of the throne Room in a player-owned house. It requires 95 Construction to build and when built, it gives 15,000 Construction experience. The player must have a hammer and a saw in their inventory to build it.
Note: Building any thrones in the throne room will make both thrones appear in both spots, so the player does not need to build the same throne twice, nor can players mix and match which thrones to build.
Construction
