Garnfellow
Explorer
What about those hunting packs (whose name I forget), where the members get progressively stronger as you kill other members, until the remaining few are nigh invulnerable?
I think about that notion quite often, but have never really gotten around to actually fleshing it out in game terms.
The Huntsmen of Annuvin -- a very cool idea. Lewis Pulsipher did a 1e AD&D interpretation that appeared in Dragon magazine No. 40 (August 1980). And I did my own 3.5e conversion of Pulsipher's take.