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From Wuw Archive

The wibbles are normally harmless creatures onboard the ship for an unknown reason. They are timid and small, and would do no harm. Except for one condition. If the target is a robot made of titanium, the Wibbles will hunt them down and devour them, due to their all Titanium diet. They appear to be small and soft, of many colours, with a full set of sharp teeth hidden under the fur. They are also known for their wild reproduction, where a single one can multiply into 100 more in 10 seconds.