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Since its a weak enemy CR 8 should be enough. Page 48 of the book has some quick guidelines to CR that can be applied to monsters too: 

CR

8 - Easy 10 - Baseline 12 - Hard 14 - Extreme 

Hehe thanks so much! I was looking all over the book and somehow missed that. This helps a ton! I can't wait to write all these ideas down. Brave Zenith really has so much openness for creation that its really exciting even though I've never done it before!