Wether you are Guardian or not, you can do this quest.
Go to your travel map, and click on Fairwind Springs.
If you aren't healed, simply click on the water to get healed.
Then all you have to do is click on the Stone Pillar in the middle of the lake, and it will take you usually to a fight. On occasion after the fight you will get a Treasure Hoard with 200 *220 For X-Guardian* and 960 gold in it. On days with 10% gold bonus you get 1056 gold in the chest.
Hope this helps people get rich quick!