[Snake]

That'd be interesting but I don't know how it would interact with the overworld as you mine it in combat. Outside people would just suddenly see a stone disappear when battle is nearby.

Unless you mean battles spawning with "additional ores/wood camps" that you can sacrifice a few rounds to fill your pockets. Then that'd be nice for solo play a little. Not much on team since it's another turn of waiting when you could just go for the next mob for more exp.