Ralph

Frenzied Gerbil

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Sources — 3 recorded facts, by chapter

Chapter 45

Ralph is a Level 11 Neighborhood Boss, a Frenzied Gerbil and champion pit fighter of the kobold training grounds who lives in perpetual rage and wants to triple the Black Death's human death toll.
Ralph is a fist-sized gerbil whose mouth opens impossibly wide into a frothing set of gnashing teeth, and he is launched at enemies from a shoebox-sized reinforced carrier.
Ralph survives being swallowed whole by a dingo, bursting back out by exploding the dingo's head, before Carl finally stuns and crushes him.