How do I make a wall that heroes can't pass, but NPCs can?

Use a hero movement or avoidance zone (this is a new feature in ichorescent). For example, put Zone 1 on the tiles you don't want the hero to step on, and then set "Hero Avoid Zone: 1" in the general map settings.

See Also

• How do I make a wall that NPCs can't pass, but heroes can?
• How do I prevent an NPC from wandering far away from its start location?