Flameborn 
Citywall Block
Blocks Epic
A neglected building material which is often used to building high and sturdy walls. This block protected the denizens of many cities before the fall
Crafting
Workbench Used in
This item is not used in any known recipe.
Source: see “Citywall Block” on the Enshrouded Wiki (enshrouded.wiki.gg, CC BY-SA 4.0)