The Beowulf only appears at night for hunting and during the day it rest inside its water barrow. they can generate electricity which is use for countering prey. Legend said that they were the remnants of Fenrir who was slain by Thor.
Something possessed me to come back to this one again. When I came back to this I thought the pay off can be push even more and logically if the sphere has gotten that big, large amount of surface had to be ripped out. So there you have it. :>