magicwalls
terrainmanual page 30
magicwalls
Arguments
Takes no arguments.
What it does
Ethereal units cannot pass through walls at this fort
— modding manual, page 30 (as a terrain command)
From the base game data
terrain data
magicwalls
Interacts with
walls commandsiegeweapon commandsiegetunnel commandwallkill commandstonekill commandpasswall commanddeployoutside command
walls make a location defensible under siege; the wallkill and stonekill weapon flags are the counters (x5 and x2 damage against walls). siegetunnel lets an attacker surface inside the walls, passwall and deployoutside bypass them, and magicwalls stop even ethereal units.
— manual + base-game usage