I could be [i]very wrong[/i] about this but as I understand it you need to get the FotL memento (which drops randomly), equip it to a weapon, and that'll allow you to use the shader.
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[quote]I hope someone has more definitive info than I do! 🤞[/quote] It was good info. Just to add momentos can only be applied to certain weapons like crafted weapons and ..... adept weapons if I'm not mistaken.