Which parts do you still need for this / what level are you?
The Frost Heart can be acquired in Permafrost just a little bit into the zone. It's a boring camp, but the safest place to do it is like...almost literally right at the entrance. You zone in, walk up the little ramp, and then go down the hallway, there's a camp fire in a little cubby? The mob you need can spawn there. Took me awhile camping that room. If you're 36ish the mobs should be green or super low blues to you iirc. I camped that at 36. I tried screwing around, finding spawns deeper in the zone--f that noise, it was way too dangerous. Just that entrance spawn, slow and steady.
The skeleton is actually kind of a pain, that earth elemental pet is way, way stronger than the mob. The guide in the wiki works, you just need to be careful, the second "Note" in the wiki:
https://wiki.project1999.com/Staff_o...ate_Flux_Quest is how I did it, but you need to like, seriously have SoW, be at max root range, cast root, and haul it to the rathe zoneline with levitate up. Have the map up, learn exactly where to run to get there, as soon as Root finishes casting start running to the zoneline. If the pet gets within range to root you they'll beat you to death. If you want, you can wait at the zoneline and try to snare the pet before zoning with Bonds of Force, it's just risky if you aren't buffed. And have a teleport / abscond up so that after you kill and loot, you leave the zone to drop aggro from the pet, that pet is hauling ass back to you after you engage the skeleton.
For the fire heart, I honestly just hung out in the zone with invis on and asked someone to let me know if one dropped and when one dropped I went over and looted it. If you're higher level you can probably break the camp on your own but there's a lot of patrollers and they move fast so be careful.
And the lambent stone, I mean, that's whatever, you can just buy that from someone.