Is there any easy way to make invisible walls?

[unblest]

I made some spawners to make them fight each other in Jhelom Pit, but some of them cowardly run away and end up gets killed by guard or gets stuck somewhere.
Is there any easy way to make invisible walls so NPCs can't go across it? I'd prefer if players can cross it but NPCs can't.

 

[Ozzer2016]

Props the spawner and check the home range or you could use blockers and a teleporter, or place walls with pandoras box and then props the wall and make it invisable.

 

[sahisahi]

Or put xmlspawners that put the npc back in the arena

 

[Falkor]

Don't know how this script is missing from ServUO's repository so here goes!

This tile allows players and tamed creatures to pass over it. Anything else, including NPCs, cannot. Note that mage-AI NPCs will teleport past it as they do with any obstacle so you would have to layer it with an LOS blocker if that's your goal.

 

[unblest]

Don't know how this script is missing from ServUO's repository so here goes!

This tile allows players and tamed creatures to pass over it. Anything else, including NPCs, cannot. Note that mage-AI NPCs will teleport past it as they do with any obstacle so you would have to layer it with an LOS blocker if that's your goal.

Thanks this script is so convy and works well!