Magic Forums

So my boyfriend was being attacked by negative entities. Since none of them seemed attached I charmed a piece of polished, petrified wood with a lavender candle and moon water for protection. He keeps it in his pocket all the time, and it worked really well until recently. I know he started wearing a steel chain, so could that be interfering with the charm or is it just wearing off? My protection spells always work, so I'm completely befuddled.
I should note that any sort of metal does not like me, from my experience with copper, steel and iron pendulums.
~Rai