I was wondering this myself. So thank you for the answers. I have a fade-touched silverite but it is the one that does lightening damage rather then the +5 guard on hit variant!
I'm rocking the fade-touched obsidian on my Knight Enchanters Battlemage Armor for the added guard (overkill with fade shield... I know lol). But with my Seer Staff I tend to dupe dragon teeth and keep crafting Seer Staffs till I get the Masterwork bonus!
Essentially a dragon tooth Masterwork bonus Seer Staff crafted from Dragon materials (for highest possible DPS) and a Superb Rune gives you 207 DPS. Essentially you Spirit Blade and Fade Cloak are absolutely devastating! 
Definitely OP but in RPGs like this where I'm playing solo... I love OP and glitches like duping lol!