Commission for iconBurstCoffee on FA! Part 2 of 2.
The Manatear has plenty of different threats, but this one is indirect. Far upstream is a large technologically/industrial themed hive, the run off causing secondary effects.
Large landmark TF effects tend to create sprawling ecosystem of related effects.
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I could see this river catching a great many more victims. Somebody's bound to see that fancy toy dragon floating in the river and go out to retrieve it. Next person along will see two fancy inflatables in the river, then three, then four, and so on!