This page offers a guide on where to locate and how to complete the Cernely Offering Altar, which is a Mystery located in Ledecestrescire.
Offer up Hare’s Feet x3
This offering altar is located between Sedwella Monastery and Wenloch Abbey. At this altar, you’ll need to offer three hare’s feet, which are harvested from hares. Luckily, there are loads of hares in the immediate vicinity so you’ll get three lots of feet in no time. If you’re struggling to spot the hares, as they are quite camoflaged, make sure to use Odin’s Sight to your advantage.
When you’ve collected the required materials, offer them up at the altar to complete the mystery.