Excrucio Eternum is one of my top 5 all time favorites! I highly recommend this one! Agree with the OP that you MUST download the custom music to be able to enjoy it fully - I personally think it is the best module soundtrack I have heard! Elegia Eternum is excellent as well. Penultima Rerolled is a lot of fun as well - just took a little time to get me hooked. And Hex Coda might be the best of all!!!
^^^
Stefan fanboy!