The main problems I have with the planar convergence plan, are the city needing to be evacuated... and that sounds both difficult, and likely to result in looting, plus civilian deaths, damages.<br/><br/>(Plus some people just won't leave.).<br/><br/>And second, the whole "may burst out of the lab" part, which again leads to casualties.<br/><br/>This kind goes for the 'Hallow' plan...  A good idea as far as it goes, but it will instantly alert any intelegent undead inside that the fit is about to hit the shan, and so they may lead a charge outside the Hallowed area.  (Those pesky casulaties again.)<br/><br/>I think individual protections from Evil, plus invisible  to undead spell, means a quick strike with very minimal casualties, as before they know they have a problem, poof, there's lava pouring in "from the entrances"!  Which traps them, then kills them, with zero chance of a breakout, or any casualties.  (Besides possibly us.)<br/><br/><br/>Hense Kasumi liking this plan.