Making a CoC Assasin atm! Lancing steel
https://pathofexile.gamepedia.com/Ungil%27s_Harmony(250-350)% increased Global Critical Strike Chance
Your Critical Strikes do not deal extra Damage
Then you also have Elemental Overload, no crit multi.
Would take like 14passive points to get 350crit chance, maybe even 30passive points
(7%crit chance weapon+3.5%assasin)*(1+3.5crit amu+2.5crit passive)=73.5%crit chance = (93%crit chance when spam diamond?)
10.5*3.5=36.75%crit chance without amu (60%crit chance when spam diamond)
93/60===>55%more crits when use amu and diamond flask
73.5/36.75===>100%more crits when use amu, and not spam flask
73.5/60===>22.5%more crits if use amu instead of diamond flask