Hussar
Legend
No, you're missing it. It's literally a WMD - it kills everything (well, low-level everything) in the multiple-mile radius of the spell. It starts as a Divination, but the metamagics turn it into a nuclear explosion.
It's because the Locate City spell was mis-written to have an area-of-effect, which it really shouldn't. House ruling that is the easiest fix.
I disagree. The easiest fix is to make sure that this doesn't happen in the first place. It problem is with the area of effect. The designers should have caught that before publication and/or errata'd it soon after. To me, THIS is the best fix.
Simply telling each group that plays to reinvent the wheel whenever a known problem occurs is not the best fix. Although, to be honest, from the designers point of view, dumping it off on the players is certainly the easist fix.