| Discovery Type | Historic Site |
| Discovery Name | Offa's defense |
| Rank | ★★★★★(5) (Number of Stars on Discovery Name card) |
| explanation | An earthwork said to have been built on the British Isles around the 8th century. It is said to have been built by Offa, the king of Mercia, in order to defend his territory against invasions from the Seven Kingdoms of Era and Wales, which was a forest of small states. |
| Era | |
| Deck Points | 10 (Required Deck Points for debate deck) |
| Difficulty | 12 (Rank of skills required for discovery) |
| Experience | 840 (For adventure jobs. Excluding company benefits, beginner bonuses, etc.) |
| Remarks | Discovery Name Card:420 |
| 最終更新 | 2023-10-08 11:12:09 Passing navigator @guest |