I am using the Primordial Unique Truesight Glass which gives you a chance to trigger Deadly Strikes (300% addtional crit multi) for every 1% base critical strike chance over 100% up to 140% chance.
My build currently has 22% base critical strike chance ( 8% from skill + 9% from relic + 5% base from character creation) and 568% increased critical strike chance from gear. Using the critical strike formula that comes to (1 + 5.68) * 22% or 147% base critical chance in total. You can view my current gear here:
After testing for several minutes on a training dummy not once did my shadow rend get an Orange critical strike number which signifies a deadly strike has occurred. My shurikens on the other hand have procced several deadly strikes. I’ll try to attach a video later showcasing a small 1 minute test I did. Youtube is taking forever to upload for some reason today.