Aside from the [Dragon-Hunting Crossbow Tower], Lin Rui also noticed a rather good schematic for the [Obsidian Wall] in the stack.
[Obsidian Wall: A deep stronghold and high wall that guards against both internal and external threats. This wall is constructed using Mithril and stone mines as the foundation, consuming 1 unit of Mithril and 10 units of stone mine per meter. Basic durability is 2500. It comes with the trait [Solid], granting a fixed reduction of 200 damage points.]
The basic attributes are fairly mediocre, but what Lin Rui really cared about was the [Solid] attribute.
There were also three or four other wall building schematics, each with their own unique effects. Lin Rui isolated this one because he believed it had the greatest potential for enhancement, potentially improving the [Solid] trait to provide over a thousand points in fixed damage reduction.
With such an effect, many low-tier attacks would not be able to make a mark on the wall.