Familiar Spirits who take the form of a Weasel most usually take the form of a short-tailed weasel which is sometimes known as an ermine or stoat. It is about 10 to 18 inches long and weighs about 6 to 8 lbs on average. Weasels are well known for their ability to get out of tight spots and their ability to discern things that may be hidden. This translates into them providing their bonded spell caster with a +2 modifier to Perception skill rolls, Character Deductions (see p. 85) and Intelligence Saves.