Yep. The goal / guideline was to 'crusade' against a 'magic island and its inhabitants'. I went through my minifigs and picked out anyone who looked like he / she could live in such a place, and Zahru Trollarm seemed to fit that description, and is a formidable enough minifig to leave a lasting impression on people who see him... at least I hope.
Oh, and since Zahru is a planeswalker, that could actually be him, fighting random battles in his free time
That blue pillar is a waterfall coming down to crush a guy. If I had enough blue transparent pieces I would've used them instead so you could see the silhouette of the guy inside, but alas. I got the idea for most of the magical effects from the Vincent Gage storyline (and old castle website that is now gone) which had a very similar battle at one point and also a chapter where Vincent Gage's entire party was crushed by ridiculously huge MOC's of magic effects.