This is one of the worst quests for a character below level 10 to attempt to do solo. There are several things working against you during this encounter.
1) Location. The encounter is at a Darkness Rising dungeon entrance (28.5k, 8.5k East Svealand zone). There are aggressive mobs roaming nearby (demon-tainted stags that are Purple to a level 9).
2) Time. The Dwarf Bone Skeletons spawn between 12:00 a.m. to 05:00 a.m. ingame-time. There is not much time available within those hours to allow for a respawn, in case you mess-up or die/release.
3) Fight two at the same time. Even as a solo, you pull one of them and another comes. I know that you only need one dwarven skeleton dust to complete this quest, but if your character can not handle two of them at the same time, i suggest either getting teammates or do this at a higher level.
4) Finishing Hit. In order for the quest item to drop from them, the finishing hit must come from your House gift (for example, the Bow of Winter is a House gift for Hunters). If you do not have your House gift for this quest, you are not able to complete it.
The Dwarven Bone Skeletons are Yellow to a level 9. I attempted doing this solo and died.
I tried again as a level 10. I pulled one with a bow and switched to spear for melee. I let my pet attack the other, to keep it distracted. When the mob that I attacked was down to 10%, I switched to Bow of Winter, dropped back for some distance, and shot/killed it. I got the quest item and ran back to Frimeth.
Upon completion of this quest, I was rewarded no experience and no coins. I was rewarded the Dwarven Boots of Air (100% quality leather). This item was useless to me, since level 10+ Hunters can wear Studded armor.
This quest is not worth the effort to complete below level 10 solo. I suggest that you exercise your quest-remove ability and skip this quest.