DISCLAIMER: Your Steps and Tasks may be different
This is the second part in a nested quest. You must start the Grenlock Clan quest first.
Siv is in East Svealand, at the largest lake has what looks like a sideways "Y" in it. Siv can be found on the piece of land where the river breaks into two, in the center of the lake. He is a spirit named Siv Alfevson. The loc I found him at was 20000,44380,4600, although he appears to roam around the island. After a brief conversation, he will send you to find his wife, Ulga. Ulga is located in West Svealand, NW of Hugginfel. She will talk to you briefly, then attack you. She conned green to me at 17 and wasn't much trouble to kill, even though she started at close range. She drops a piece to the Grenlock Crest. Once you return the piece to Anrid, he will give you Runed Mystical Boots.
You have been given the Siv's Spirit quest.
[Step #1] Seek out spirit of Siv in East Svealand.
Siv is found on the same isle where Riv spawns, which is across from where Klippa is. Go to Dvalin and go past the guard tower to just past the ant camp, there to your left across the river is an isle, Siv is there or near it swimming in the water.
Siv Alfevson says, "Life is never to be taken for [granted] for one always reaps what they sow."
Siv Alfevson says, "I traveled many years, running in fear from the terrible consuming northern storm. After may years my brothers and I settled our armies and clan and built shelter and a new civilization after the terrible storm that wiped away our homeland. Our father stayed behind, leaving us with only pieces of his armor and pieces of our great clan crest of Grenlock. I too stay behind to watch over what is left of [our clan] here in these parts."
Siv Alfevson says, "There is little of the Grenlock Clan left, only our people and the shards of the crest my father entrusted me to us, both now scattered to the wind. You must make sure to gather the crest piece from my long dead wife, [Ulga}. This must be done at all costs!"
Siv Alfevson says, "Search for her soul and ask for the Grenlock Crest shard. Should you succeed, the House of Hel shall make us whole! I can assist you no more Spiritmaster. May the gods guard you on the rest of your journey, just as they have done with me."
[Step #3] Find Siv's wife Ulga within West Svealand. Acquire the Grenlock [crest] piece!
To find Ulga, from Aylarn (in front of lean-to) run west, then you'll see the tower and the camp of Bloodfellags. At the camp take the path and head a bit northwest (maybe a bit more north than west) then we saw her wandering around, near 31k, 20k.
Go to Audliten, go north across the bridge and take a left at the crossroad. Follow that trail a ways until you get to the top of the hill where there is another crossroad. Take a left (If you go right, you will end up at the West Gate). Follow the path until the next crossroad. There are 2 stumps, one on the south side of the path and one on the north side. If you stand next to the one on the south side and point yourself due South, go forward and you will run into a tree. Just past that tree is where i saw her each time. I hope this helps reduce some of your search time.
Be careful, there are also some wolfpacks running around there too. Ulga conned blue at lvl 15. And SOMETIMES a ghoul will spawn while you are killing her.
Approximate Loc sights (she does roam):
Ulga says, "How may I help you young one?"
You say, "crest"
Ulga says, "The only way you could know about the Grenlock Crest is if my husband [Siv] had spoken to you or you are an agent of evil!"
Ulga says, "It is doubtful that he has sent you! If you wish the crest, you must take it by force!"
She then proceeds to begin casting...kill her, get the crest.
Ulga says, "I have failed you my love!"
You receive a Grenlock Crest piece from Ulga!
Your standing with the spirits of Midgard has decreased.
[Step #4] Return to Anrid in Jordheim.
Anrid says, "You have returned. Did you obtain that which was required of you?"
You hand Anrid the Grenlock Crest piece.
Anrid says, "I see you have met Siv. He was very kind to his people, always wishing them the best and his family. Perhaps someday the Grenlock Clan name will be restored. Safe journey Spiritmaster.
You are awarded experience!"
You receive Spririt-dweller's Gloves from Anrid!
You have finished the Siv's Spirit quest.
Runed Mystical Boots -- Runemaster
Spirit-dweller's Gloves -- Spiritmaster
Boned Mystic Boots -- Bonedancer
Soothsayer Gem -- Warlock