Skyrim:Kyne's Sacred Trials

Quick Walkthrough
# Speak to Froki Whetted-Blade.
# Defeat the Guardian Mudcrab, Guardian Skeever and Guardian Wolf.
# Return to Froki.
# Defeat the Guardian Bear, Guardian Mammoth and Guardian Sabre Cat.
# Return to Froki.
# Defeat the Guardian Troll.
# Return to Froki.

Detailed Walkthrough

Visit Froki's Shack and speak to Froki, a hunter. He will lament the worship of the Divines and pine over the old Nordic traditions that honor Kyne. If you agree, he'll grant you a blessing to seek out the guardian beasts of Skyrim and perform the Sacred Trials of Kyne. All the guardian beasts are unseen until you engage in the quest and inhabit areas populated by normal creatures of their same species. You'll have to go out and hunt the lesser beasts first before he gives you the set of greater beasts to hunt. The final trial is to hunt and kill Kyne's troll champion. If you struggled with the guardian mammoth, this part is potentially even more difficult. The troll spirit is inside Graywinter Watch and will almost immediately attack alongside two other normal trolls making this a tough fight for lower level players. It is a very small cave and if you sneak on entering, all three can be picked off from the entrance (fire bow recommended). Any sort of fire damage is useful on all the creatures involved in this quest, especially the trolls. Two dead bandits have minor loot, alongside Froki's bow (on a barrel). Froki will reward you with Kyne's Token upon completion of the quest.  

Guardian Beast Locations
Mudcrab Guardian Spirit - Whiterun Hold, just west of Broken Fang Cave, and southeast of Gjukar's Monument  
Skeever Guardian Spirit - The Pale, around the Windward Ruins  
Wolf Guardian Spirit - Falkreath Hold, unmarked wolf den southwest of The Guardian Stones  
Ursine Guardian - Falkreath Hold, south of Knifepoint Ridge  
Mammoth Guardian Spirit - Whiterun Hold, unmarked Mammoth graveyard just west of Loreius Farm  
Sabre Cat Guardian Spirit - Winterhold, just west of Bleakcoast Cave  
Guardian Troll Spirit - Whiterun Hold, inside Graywinter Watch  

Notes
You can use the Animal Allegiance shout on all the guardians, thus making them stand there while you kill them.
You can find Froki's bow inside Graywinter Watch. He'll allow you to keep it if you tell him you found it.
The Guardian Bear is located near two interesting features:
A fairy circle of white caps with a copy of Father Of The Niben and a random staff laying in it. 
A shrine of Akatosh with a copy of Tragedy in Black at its base.
From the guardian sabre cat follow the face of the ice wall southwest. A novice-locked chest and a copy of ''2920, Rain's Hand, v4'' can be found in a small alcove to the southeast.
Difficulty for this quest is based on the ability to kill a mammoth. If you're able to kill one in open combat you should be able to handle this quest. Alternatively, the mammoth can be killed by ranged attacks from the hill to the north.
Despite being spectral in appearance, the guardian spirits seem to retain all aspects of their represented species and are killable with normal weapons. They leave behind ghostly remains, but the loot table matches their represented species as well.
If you decline this quest, Froki will not offer it to you again, but the decline option remains in your dialogue choices.
If you back out before Froki offers the quest, it is as if you declined the quest.
Running "setstage dunHunterQST 21" should allow you to do the quest if you are in this situation.
If you own Lakeview Manor, on your return it may be attacked by bandits, which can engage in combat and kill Guardian Wolf and his pack. Still, the quest will progress as normal.
Although Froki says "you can count me as a friend" upon completing the quest, there is no change to his disposition, and low-value items in his house are still marked as stolen.
An Emperor Crab Guardian Spirit is added by the Fishing Creation, although it's unrelated to this quest.

Bugs
 
 
 

Quest Stages