Build amber either on Bhumi (ideal, especially if you get lucky and get a 128) or on the Nauls at Conflux 3 (the same ones used for Zeni, avoid Cuelebre unless you have a plan for it) until max (255).
(edit: Bhumi notes: there are 5 in the zone, respawn time is 15-20, I have no idea what triggers them to respawn. The one with ID 170 I saw all of once, but 171-174 were showing up like clockwork. I thought it was killing some specific trash mob, so maybe it's one that doesn't drop anything anyone needs for Empy?)
I didn't build blue on purpose - just opened reds to get to the top time-extension-containing from reds once the campaign ended, but you could if you wanted I guess.
Caoineag at Conflux 4, while they do stop to cast, are all in a small area and sound/blood aggro so you can just run by them to pull them. They were my preferred cleave target, though sometimes people who aren't cleaving want to kill some to pop that NM so I didn't always take them all. Failing that, the nearby Canyon Scorpions sound aggro, just wider spread territory.
Once you have all four KIs, pop over to Glavoid, maybe pull some worms on the way back and cleave those too. Sound aggro is so much better than sight aggro for big pulls. Chloris's nearby Pachypodium friends don't aggro, or they'd be fine too.
