AI Wander

Lag: Delay in world ticks between movement. 

mob //Declaring it's going to be a mob
    NPC //Better Specification of what kind of mob (Can be anything, but in this case, it's named NPC.)
        Guy //NPC Clarification of which (Name)
            icon='NPCs.dmi' //the npc's icon file
            icon_state="Guy" //specification of the name of the icon in the icon file.
        New() //Creating a new proc
            ..() //declaring the new proc
            while(src) //Explaining when to run the process
                if(prob(rand(80,90)))//Rolling a dice (Giving the illusion it is running on ticks.)
                    step_rand(src) //Making the src(mob/NPC/Guy) step randomly
                sleep(rand(40,120)) //Resetting the Proc

mob //Declaring it's going to be a mob
    NPC //Better Specification of what kind of mob (Can be anything, but in this case, it's named NPC.)
        Guy //NPC Clarification of which (Name)
            icon='NPCs.dmi' //the npc's icon file
            icon_state="Guy" //specification of the name of the icon in the icon file.
        New() //Creating a new proc
            ..() //declaring the new proc
            while(src) //Explaining when to run the process
                walk_rand(src,rand(40,120))

/*
Format: 
walk_rand(Ref,Lag=0,Speed=0) 
Args: 
Ref: A mob or obj. 
Lag: Delay in world ticks between movement. 
Speed: Speed to move, in pixels. 0 uses Ref.step_size. */