This short preview - designed to promote a Kickstarter campaign for the complete product - begins with an explanation of how to create a 'Gruesome' monster by adding one of the gruesome templates to an existing monster (or, of course, one of your own devising. Each template comes with an example creature, but although certain templates seem suited to particular types of creature, it's suggested that mixing them up a bit can result in interesting and challenging foes. There are also suggestions for how to use the monsters to which you apply that template to best effect and a set 'shock value'.
The 'shock value' is an indicator of the sheer visceral horror induced by meeting the gruesome monster, a real treat for those who want to add a twist of horror to their game. You may be aiming for a horror-themed game anyway, or perhaps you want the shock factor of introducing one such monster at an appropriate place in a more regular game. Either can be an effective use of these templates.
The samples presented are the Bound Horror - which poor beastie is bound to a given location or object (or even an individual) - and the Forgotten - which exist in more than one reality simultaneously and can cause amnesia in those who encounter them. Hopefully you can forget meeting one, 'cos they look quite repulsive and, yes, gruesome!
If you like the look of this, trundle over to the Kickstarter and sign up!