seems to make no difference your level. i had passed this field before and seen the big parth a few times which conned above my level till i was 28. conned yellow then. I also had seen the smaller parth. never thought to conn them. pumice ring was of little value to me (green) so i passed it on to another of lower level. I think the big parth could have been taken down with a group @ level 20-22. i took it down as a druid @ 28 easily.
The empryeans conned green to me and would not respond. (neutral)
only way i got each part was to just simply kill.. ill have to find out how that affects me on other quests.
Going on to go an a siabra hunt now.