Board Thread:Speculation House/@comment-12443850-20130808003319/@comment-4010415-20130925225414

WC-83 wrote: Angren Túrë wrote: I feel like those monsters are too complex to be really scary*. You're trying too hard to figure out just what the thing ''is. ''I think subtle (to a point) mutations of earth animals get the best effect. You have an idea of just what the creature is capable of, and what kind of monster it is. Personally, I think that the Grim up to this point have been very well done; terrifying and otherworldly, but subtle as well, in terms of design.

exactly, I personally found the new Beowolf quite intimidating when it was revealed in ep. 9? Anyway, it creeped up from behind made itself known, and then just let out the most fearsome roar ever, all in 5-10 seconds of it's debut.
 * That is not to say it wouldn't be scary in-universe.

Episode 5.

The grimm in episode 9 is the Boarbatusk, which is, well, a boar.