I had an idea. Sand worms are a huge part of dune and essential to spice production. So I was thinking that spice fields should be added for people to harvest. Perhaps there could be a random event called worm sign where a worm shows up in your colony and attacks anything built on sand or burrows around for a bit and then they leave spice kinda like the thrumbo events but with more terror!. Actually a better thing would be a spice blow where a load of spice pops on the sand some place and then as you gather you have a random chance to attract a worm. Even a map event that is like spice field found the risks are the longer you wait the more bandits/worms could be around when you get there.

+1