Tempered Spinal Blade Backpiece
Assassin stats are sadly left out on Ascended Trinkets (and I don’t think there’s an Assassin Exotic Backpiece either.) I have both the Tempered Spinal Blades, along with Chaos of Lyssa (and some others like Light of Dwanya) and none carry the option to pick Assassin (I specificly checked for my Mesmer.)
Recently they’ve introduced some Assassin accessories (reward for unlocking all CM and Arah skins) so I do expect them to introduce a full set of trinkets eventually, how-ever I doubt it’s worth waiting just incase it happens and take Berserker for now. The difference is small, especially if you have every other possible piece of Assassin gear.
Thank you Esmee
Actually quite weird they do not have ANY ascended backpiece with assassin’s…but as Esmee stated..the difference isnt that much of an issue