every castle needs a trench! they would act more like speed bumps.
Defense (trench):
Lv 1: trench
Lv 2: trench w/ rocks
Lv 3: trench w/ rocks & water
Lv 4: trench w/ water & algae
Lv 5: trench w/ sludge
Lv 6: trench w/ tar
Lv 7: trench w/ acid
Lv 8: trench w/ lava
Offense (bridges):
Lv 1: wood bridge
Lv 2: stone bridge
Lv 3: iron bridge
Lv 4: titanium bridge
Lv 5: tungsten bridge

