Guild Wars 2

I thought of an alternative to achieving dragonite ore and champion lootbags. It’s called head hunter challenges.

1.) You buy a signet of capture from a karma vendor
2.) You cast it on a champion in the open world.
3.) Now you return to a Norn fighting arena.
4.) The claimed champion is waiting in the arena to fight you. The arena is instanced but other players can spectate, just like Queens Gauntlet but without the dome. Just an invisible wall.
5.) You can bring along one player to help you.
6.) increased rewards: 10-12 dragonite ore and 3 champion lootbags and 1 skillpoint.

additional possibilities:
a.) there is an achievement for killing every champion in the game. You have a checklist where killed enemies got crossed out.
b.) once you’ve defeated all champions in a family, you unlock a mega-champion of that family as extra challenge.
c.) rewards would be minis for each killed family, a 22slot bag for each family.