SOLVED. Fantasy book/series where a group of children collect or battle monsters. There was a goblin in a tree on the front cover. [s]

[Daniel]

Looking for book/series where a group of children collect or battle monsters and mythical creatures. There was a white goblin-looking creature with long fingers in a tree on the front cover of the first book. It had kind of a dungeons and dragons feel to it.

I think I read it sometime between 2007 and 2012

[Shawn]

You may be thinking of The Revenge of the Shadow King of the Grey Griffons stories.

[Daniel]

Yup, that was it! Thanks!

[Kris]

Glad you found your series, Daniel. Link for Shawn's find - The Revenge of the Shadow King (Grey Griffins #1) by Derek Benz.