Nobody seems to be talking about this yet. Farming central champions seems like it would be a little bit more difficult than world bosses. Particularly because we haven't done it in a long time. So, there are a few places I remember there being plenty of champions:
In Frostgorge Sound, there's still the old rotation of Ice Troll, Corrupted Quaggan, and the Triple Threat in the north-western corners of the map. I'm not sure if the non-experience granting champions count, so I'm hesitant to suggest clustering around the Claw of Jormag to farm the champs that spawn during the event.
For lower levels, Kessex hills still has plenty of champions. The only three I remember are the Krait Witch, the Toxic Spider, and that one Champion Centaur, but I'm fairly certain there are more there.
When it comes to events, Cursed Shore also has a champion grind. From the Temple Events, to the Toxic Ooze, Champion Giant, Champion Abomination, Rottbeard, Broodmother, and the Risen Shark at the very far southern corner of the map. There are many dynamic events that will just spawn champions as they go on, if they get enough people. I'm probably going to head here myself, both because the risen potions allow for quick slaughtering, and all of the fodder enemies give plenty of drops.
However, my memory fails me. Does anyone have any other particular locations or strategies for champion farming?
"Self awareness is knowing when you're sitting at the throne of ignorance." --Leo G.