Skeleton Watchtowers are pieces of skeleton equipment located in the Maelstrom Quarry in Crux Prime. There are three, each one located near an entrance to the Quarry. They can only be destroyed using Spinjitzu. To bring down a tower, simply destroy all three support legs. Once you've smashed your first leg, you have a limited amount of time before it rebuilds, so smash the other two legs quickly. Once the leg supports are removed, the Watchtower collapses. Two Skeleton Watchmen spawn from the rubble of the tower (this is currently the only way to find Skeleton Watchmen).