public void moveArtifact(Hero dst, Artifact art)
	{
		if (artifacts.remove(art)) {
			if (active.containsValue(art)) {
				for (ArtifactType at: active.keySet()) {
					if (active.get(at) == art) {
						active.put(at, Artifact.DUMMY);
					}
				}
			}
			dst.artifacts.add(art);
		}
	}