Rangers!
Where do you slot your impulse? I am thinking of using L24 Wall of Wood (for devotion/DR) with an impulse scepter and just turtle inside our mighty AoE DoT.
I don't see many spike growth-focused rangers around these days. It seems that most people don't realize the true potential of this awesome spell. I mean, you can easily meet lame-ass artificers or divines running back and forth through crappy blade barriers. With spike growth, just cast and block and watch stuff die. With barkskin up, not many mobs can hit me anyway. Arguably, the damage might be slightly lower than straight melee, but it's AoE!
I've picked up maximize (for bosses/in mana dump situations) and my damage really picked up, I am now consistently seeing double digits, and that's on a save! Dipping Artificer for Force/Untyped spell power also helps a ton. But perhaps I should have dipped wizard instead, for bonus feat. Quicken would be nice. I guess I'll just pick it up at 21.
I guess this build is better with a bunch of past lives. I can see mobs saving now and then. How would you build your spike-growth-destructo-completionist?