Monster Sanctuary is unique amongst monster taming games in that it makes a great effort to ensure that every monster in the game is useable no matter what point in the game you are at. It's very possible to take that Blob you got at the very beginning and take them all the way to the end.
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This means that while monster evolution is a part of the game, it gives your monster a sidegrade rather than an upgrade - and it's something you'll have to
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