The first panel of this strip was used as the
Daikatana - The much-hyped, repeatedly delayed, and ultimately disappointing game from John Romero.
What's that on the book?
It's not a bear, 's a wombat. Check Penny Arcade for more info on the wombatness.
See the original Necrowombicon strips here and here. It is of course a parody of the Necronomicon from H. P. Lovecraft's Cthulhu mythos.