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I don't think you thought that through...
I was looking up info in War of the Amazon for Werewolf the Apocalypse and the description of Dorado Realm indicates that it included the world's largest freshwater lake. Which Technomancers somehow managed to shift into the Umbra.
So either they dropped something the size of Lake Baikal (volume) or Lake Superior (area) into the Umbra. Then later in the chapter says you can see the city of gold across the lake and then gives rules for swimming across it. No, YOU WOULD BE DEAD. even a garou.
and even if you do a fair amount of handwaving and said Technomancers managed to move something the size of most of New England (minus Maine), twice the size of the Netherlands, or three times the size of Belgium (Lake Superior is fucking huge, 31,000+ square miles) out of reality that is a hell of a lot of water you just removed from ecosystem and there should have been devastating consequences for local area. Not just the loss of ground water, but the effect on weather systems from suddenly having a huge source of water vapor just VANISH.
and if the meant "largest" like Lake Baikal, Lake Baikal has 20% of the unfrozen freshwater in the world in it. So making that vanish would have even more devastating environmental effects. Like "fuck up the rain pattern for hundreds if not thousands of miles" level of fuck up.
Plus removing THAT much water would actually have the earth's crust shift due to sudden removal of weight. Glaciers DO depress the crust but they melt slowly. Suddenly having it go "POOF" to the Umbra should have triggered massive earthquakes and shit.
But you know, science mages can totally ignore scientific consequences and apparently not have any paradox happen.
But hey, Sam Haight appears in same section, so anything that Sam gets even vaguely close to is full of cray-cray, so you go vanish "the world's largest freshwater lake" all you want. Nobody will notice that because its near Sam Haight. it's the least cray-cray thing going on.