@stevetrov lol Well that's embarrassing! Works great now. Thank you.

I am trying to get some creeps to avoid going through Ramparts but when I add a costCallBack function to moveTo nothing changes. Am I using this wrong? Any help would be much appreciated.

creep.moveTo(target, {visualizePathStyle: {stroke: '#00ff00'}, costCallBack: function(roomName, cm)

{

var ramparts = Game.rooms[roomName].find(FIND_STRUCTURES, {filter: i => i.structureType == STRUCTURE_RAMPART});

ramparts.forEach(i => cm.set(i.pos.x, i.pos.y, 255));

}});