This is "The Lost Stone of Arawn" Quest. Known as the "SI Neck Quest".
Description: This quest is repeatable and gives experience and random rewards.
1) Speak to Honayt'rt in Wearyall Village.
2) Speak to Nchever in Wearyall Village.
3) Speak to O'honat in Caer Diogel, she will then give you a Demo Skin. (Just check journal at this point and make sure it has updated to step 4.)
4) Leave Caer Diogel and head west out of town, when you reach the coast turn north. The Demon that you will need to kill can be found at 53.6k, 53.8k in the Plains of Gwyddneau (Marw Gwlad area). Once killed the Demon will drop a stone or bag. (Check Journal and be sure it has updated to step 5.)
5) Go back to Caer Diogel and give O'honat the stone/bag. You will receive a scroll from her in your inventory and then will be teleported to Wearyall Village. (You must click this NPC a second time to be ported)
6) When back in Wearyall Village read the scroll to see who it is addressed to (Nchever), return to Honayt'rt for your reward.
lvl 48
Rewards:(Not in order you receive them) Ancient Copper Necklace Ancient Copper Ring Ancient Roman Coin
Weapon Rewards: (chose one) #00 - Ancient Brass-Shod Staff - Generic #01 - Ancient Brass Longsword - One Hand Slash #02 - Ancient Brass-Inlaid Longbow #03 - Ancient Brass Cudgel - One Hand Crush #04 - Ancient Brass-Shod Quarterstaff - Friar #05 - Ancient Brass Two-Handed Sword #06 - Ancient Brass Lochaber Axe - Slash Polearm #07 - Ancient Brass-Tipped Whip - Flex #08 - Ancient Brass Rapier - One Hand Thrust #09 - Ancient Brass-Shod Staff of Dominion - Sorcerer #10 - Holy Ancient Brass Cudgel - Cleric Hammer #11 - Ancient Brass-Shod Staff of the Warlock - Theurgist #12 - Ancient Brass Lucerne Hammer - Crush Polearm #13 - Ancient Brass-Shod Staff of the Shade - Necro #14 - Ancient Brass-Shod Staff of the Magi - Wizard #15 - Cryptic Ancient Brass-Shod Staff - Cabalist #16 - Ancient Brass Pike - Thrust Polearm