Board Thread:Spoilers!/@comment-24304025-20150202171011/@comment-24674051-20150413153550

The purpose of the 6-leaf clover pendant, as I understood it, is solely to allow the caster, even a non-magical one, to be able to have a working glamour spell, and have it under their control. And since it is a device, not magic itself, it will work in the LWM.

I think the pendant also explains Walsh's appearance in NYC. Zelena gave him one of the pendants (I think there are 6 of them total) for his trip there.