Red Sands

I played this mod, and it's very well made. It's worth playing not so much for the new quests, but for the new artifacts, new units, Asmodeus, and many other things. You can also reach a higher level here; in the original Crossworlds, you can only level up to 50, but here, if you try, you can reach 80. There are also new companions, and because of the addition of a LOT of new artifacts (which, however, don't ruin the balance), you have to think about who to take with you, because the slots are limited. Overall, I recommend it to everyone.

Added 1 minute ago
By the way, level up Asmodeus; at first, he's a burden, but then he becomes a god.