Based on my tests, the stun duration decreases each time it hits an enemy.
1st: 1sec 
2nd: 0.5sec 
3rd: 0.3sec 
4th 0.2sec 
5th 0sec (no stun at all)
i therefore conclude that investing in stun is not a good option
Frost gives
1st: 2sec 
2nd 1sec
3rd 0.5
etc…
correct me if some values are wrong.
Man its so good that you cant be perma cc ed in this game. Thanks for reminding
You’re right in showing that stun isn’t exactly worth it for longer lasting CCs since it lasts short amount of time on players. On enemies, it lasts 3 seconds though.
Frost can be worth a try as not every player uses Frost Immune or Frost Resist but you will need a fair amount of elemental crit as Flawless Victory does reduce it by -10% (its additive) so you’d need 20% and it would act like 10% on flawless victory opponents or fast attacks.
i use nova for my elemental crit. thanks for the inormation btw 