ChaosOS
Legend
So, I know this isn't how past editions have run defiling, but in my Wednesday night Dark Sun Savage Worlds game one other side effect of defiling is you can't cast spells from recently defiled ground. So there's a power level boost, but it forces you to move a bit. (The benefit I'm providing is that when you critically fail a power activation, you can choose to defile to get a reroll. If you don't defile, there's a nasty backlash table that's worse than normal power activation fails, which can be mitigated by picking up a custom Preserver edge)
I'll also generally mention that as a system, Savage Worlds is actually really well equipped to handle Dark Sun out of the box - you have to do custom races, but the core book provides rules for how to do that. I've got a few custom edges (read: feats) like the Preserver one I mentioned, which is also not that hard to do within the system. I'm just really happy with how it's gelling.
I'll also generally mention that as a system, Savage Worlds is actually really well equipped to handle Dark Sun out of the box - you have to do custom races, but the core book provides rules for how to do that. I've got a few custom edges (read: feats) like the Preserver one I mentioned, which is also not that hard to do within the system. I'm just really happy with how it's gelling.