Dark/Nature - good combo?

[BurtHutt]

I was kicking around some options for this toon and can't decide how to proceed. Anyone have some comments on how good (or bad) this combo is? I would love to see a build if possible.

[Uun]

Nature is a very good set, but I'm not a fan of the defender/corruptor version of Dark Blast. Dark Pit is a complete waste (AoE mag 2 stun). There are 3 cones and none of the ranges/arcs match. Tenebrous Tentacles and Torrent need to be loaded with procs to do damage, otherwise they're just mitigation. Nature works better in melee paired with PBAoEs and AoEs rather than cones. I'd be more inclined to pair it with Water, Ice, Electric or Seismic.