From SkinnerZoo3D
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In AlloyedRPG, there are portals that make use of the planet's magnetosphere. Every once in a great while, the traffic through the portals becomes too numerous and the whole system collapses. This collapse reforms the topology and redistributes magical energies, allowing new creatures and ecologies to develop.
Mud Golems are an example of new forms of life spawned simply through excess amounts of magic collected in one place.