[Fantomen]

A single monster trademarked (not copyrighted, mind you) on dubious grounds in the US is not going to cause any trouble for a 2 man indie developer in sweden, just because they use a similar monster type among hundreds of others.

First, I withhold that it's far too irrelevant for WoTC to care, and second sweden doesn't have a money driven legal system where you can just sue anyone just because you're a big company. You need to actually be more or less right to win a case here.