Rubilax from wakfu series, i would keep this just for me as it appears his small and gigantic form are mixing up a bit, but posting it anyway

Usefull tags:
Rubilax,Rock Monster,Brown Body,Spikes on back,spikes on chin,spikes on elbow,horns,white sclera,pupiless eyes,red circle marking on the forehead,Body Crevices

Add These tags to get his gigantic form:

Gigantic Form,Red Body Markings