I want make radiation trigger effect but that doesnt hurt with item on you

[Chuc 83]

cool thank you

 

[Chuc 83]

If I wanted to add 2 more items that could prevent damage how do I do that. 

Is it like this

"item1", "item2", "item3" 

Or this

"item1" or "item2" or "item3"

 

 

Also how would you add damage over time