[osrs]

I'll explain something and i hope this will help you.
You want to make a weapon wich will warp you to a specified level, then, add a weapon to weapons list.
Put the script there; I won't post a full script but i'll give some explanations.
Like some people already said, if you use '//#CLIENTSIDE', what is written above that 'declaration' will work server-side and what is written below the 'declaration' will work client-side, since setlevel2 works server-side, where will you put the command at? Think about it.
Try to learn about triggeraction on weapons, because you'll need that to trigger the warp action from server-side to client-side to warp you.
That's all you have to know to make it work successful.