Medulla is one of the largest of the prehistoric characters, but always second to Fang. As such, Medulla is jealous and frustrated, and tries to best Fang, only to fall short (and usually fall straight into Fang's open maw), every time.
That said, she's still a ferocious force to be reckoned with and can often swallow other rival macros with little effort.
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A Loaf of Breab
I'm a nerd about Pokemon and I've gotta mention that's a cubone skull... not a marowak.