Short explanation to the task at the stone wall:
The location of the stones in the wall from left to right gave you the key according to the stone tablet.
The key was:
Your fourth result:
The monks got their water from a spring nearby, the Hen-spring.
In the local dialect it sounds like this:
Æ månk hintet æ Hønkild-van it lant hefra ve æ Hønkildstap.
The monks got their Hen-water not far from here at the Hen-tap.
Find the Hen-spring only 60 meters from your current location due north.
Only press ”Next” when you are at the Hen-spring.
All others then press “Refresh”.