Splash damage

Splash damage is done to walls when on other wall segment in a small distance.

• Stone walls get damaged for ~80%;
• The distance the splash travels is at least 4 complete tiles between wall segments(Safe distance seems to be 6 gaps between your outmost wall and any buildable tile)
• Between 2 connected walls segments splash damages only the adjacent segment
• A wall segment you are facing gets damaged

(All these rules apply at all times)

Splash Damage Demonstration

Player about to destroy one section of wall - notice no other sections have taken any damage yet

Once the target section is destroyed, the game applies splash damage to adjacent sections in each cardinal direction. In this case, it damaged 3 sections to about 80% damage. Note until the first wall section was destroyed these sections remained completely undamaged

Player destroys third section to break through the 3 layer wall. In all he only had to do 140% damage to get through the 3 layer wall in this example -- 100% damage to first layer, 20% to second and again 20% to the last section, since splash damage took out 80% HP from these walls as their neighbor sections were destroyed.