Starting in the Betrayal event, the statues came alive! Every 3-4 hours large alive bronze versions of the statues in town where spawned. When you killed them they would drop bronze weapons along with keys to get into the statue. These bronze weapons were retired after this one patch and are no longer available. They are large, heavy and fun to hang on the wall or wield!
The Weapons can be turned in for xp by handing them to an Arcanum Researcher. There is a level restriction (below 20 only the ones that give 5,000xp, 20+ 25,000 xp, 30+ 250,000xp and 40+ 500,000xp.
Turning in the weapons happened a lot during the Hidden Vein patch, since all of a sudden, the weapons became Attuned. Because the weapons were very heavy and hampered all but the strongest characters, many players were forced to turn them in. After much uproar, the patch after that, they became givable again. This is one of the reasons the weapons are quite rare.
The Arcanum Researcher turns to you with an air of efficiency and calm.
Arcanum Researcher tells you, "I must give you a general debriefing of the statue affair as it stands. Nuhimidira was so fervent in her persuasion that the Arcanum, believing that they were for the people's good, allowed them to be presented to the town centers. Now that she has been kidnapped, it is clear that the Arcanum was not the only dupe! Nuhmidira has stopped the dreadful sacrifices that gave these abominations life...but it appears it is too late--now they have gained sentience, they have started to take sacrifices of their own!"