Good to know that's how to kill that guardian. I beat on him for 30 minutes.

It really doesn't matter how many warnings you get, people are still going to pick it up because they are going to think that they need it for something. No one is going to just leave it. The only solution I can think of is if your character opens the special chest you have just for that ore and they put that wand directly into the chest. Not sure that's even possible without touching the wand though. And of course if you did do that and avoided getting rot, can you still use it on the guardian?