In Assassin's Creed Valhalla Wrath of the Druids, you will come across Offering Altars. On this page, you will learn where to find these altars. This will make it easier for you to max out the Dublin region.
This Offering Altar is in the eastern part of the region, right next to the synchronization point.
You need 50 delicacies to complete this side activity. You can get them by exploring the game world - they can be found in chests scattered around Ireland.