How to use Lesser Insignia of Warden?

I purchased the lesser insignia of warden, but can't figure out how they are used. It would seem that it could be used just like a glyph, but it is always grayed out in battle, whether it is in PvP, PvE, aoh, dot, or 7b. I searched the forum and did not see this addressed, so if someone could help, I would appreciate it and pass it along to others. Thanks!
Comments
you select an ally to use them. beware what it does is cause you to receive a percentage of damage instead of the selected ally nothing else, why few people use them. so in the case of lesser warden insignia, any damage dealt to the player you used it on. 15% of it would be transferred to you so that they only take 85%.
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