'Ya like whatcha see don'tcha? Of course ya do... I can smell Rat aaaaaaaaaaall over ya. And He wants to know He'll be very happy to have ya as one of His kids...'
-Gnaver, Son of Rat

And... yeah. When he beasts out he gets stronger. Larger. And a big more eager to bring more Children of Rat into the fold. It's a pity - he used to be such a nice man, but after he was made into a Child of Rat, the change obliterated who he was entirely as his body and mind (and possibly soul) were consumed by Rat, making the furry wererat punk you see today.

...

I can't say I'm not jealous!

Done by  xzudomon here on FA - he really got the intimidating nature of the beast, and helped bring out his natural hirsuteness as well. It turned out hella good :)