This would have been my answer. Plus: relatively easy to get prog-healing sword.

Everyone mentioning rangers aren't considering the terms of the original question: "any terrain".

Other contender is LG conjurer, but only after they get archons so that fails the "1 to 51" requirement.

Arial (or felar if you're willing to sacrifice a bit of tankiness for some extra damage output) spear/staff with tanking related legacies would also be pretty nice, but only against melee. Dance, Ward, or Fluid Deceptions.