Taking Whitewall was what did it. For a fairly mundane (not prosaic, mundane) description of how that was done, read King of Sartar - it'll tell you where the meteors landed and so on.
But the more interesting question of why Whitewall was so crucial isn't in there. Sure, it was the last Great Temple (in RQ terms), but all the clan-level shrines remained. What we came with on the WhiteWall list was the idea that due to gradually escalating magic on both sides, Orlanth was in some sense "tied" to WhiteWall - actually physically present there to some extent since the Bat was repulsed right back at the start of the siege, and increasingly so as time went on. I'm not sure if we ever put the conclusions on the WWWiki, but Rob used them in his game, so you can see what that looked like immediately post-Bat in his chronicles. www.whitewall.info - sorry, I can't find the exact link from this PDA.
There also seems to have been some sort of synchronised "killing" of Ernalda, since her magic stops as well, but I have no idea how that works.
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