It seems to me that during every other Star Trek episode, the crew comes across a space-time anomaly (naturally occurring or not). Some of them were proven to be harmless, eg the inversion field in (VOY) Twisted, but most of them can be quite dangerous, eg the anomalies in the Delphic Expanse, the graviton ellipse in (VOY) One small step and so on.
In principle, if one could control the path of one of these anomalies, you could slam it on the home-planet or the starbases of your enemies and vanquish them as unlike an asteroid, anomalies are not so easy to deflect/shoot down.
So my question is: has any race in the Trek universe ever managed to weaponize any of these anomalies?
Canon and EU are acceptable.