How do I make a wall that heroes can't pass, but Npcs can?
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There is no easy way to create a wall that blocks heroes but not NPCs. To achieve this effect as the engine currently stands, one would have to make extensive use of relatively complicated plotscripting. The simplest way would probably be to have an on-keypress plotscript that checks the location of the hero and prevents the hero from moving through certain tiles via the suspend player command, while not affecting NPCs or the wallmap at all. For help constructing such a plotscript, try asking on the various community forums.