Update (PTS WEEK 3, https://forums.elderscrollsonline.com/en/discussion/511000/pts-patch-notes-v5-3-2#latest):
This set now reduces the target’s Weapon and Spell Damage by up to 20% for 5 seconds with a 15 second cooldown, rather than reducing it by up to 268 for 8 seconds with a 12 second cooldown.
While certainly still a nerf compared to Major Maim, it is noticeably better than the abysmal ~260 WD/SD reduction the previous PTS iteration had. The below CMX courtesy of AnotherMyth from Worst In Slot Discord server shows the PTS Vykosa on Olms:
I personally haven't done any tests yet on PTS but the set looks like it can still be effective in the niche scenarios it's being used for on Live.
The swap to make it more passive with a lesser effect didn’t yield the results we had hoped for, so we’re putting it back into a category where it’s strong for a short period of time, but we’ve increased that duration a bit to help it be more usable in situations where you haven’t perfectly memorized the time frames for each attack.
A valid point I suppose since it did punish tanks including myself for mistiming the proc by not providing Major Maim for a specific attack at the time for the group. Although I would also argue that was also an attractive feature of the set, the fact that it kept you on your toes/you needed to know the fight (most tanks become very familiar with timings of boss fights anyway).
Additionally, we opted for a percentage reduction over a flat decrease to prevent situations where groups could stack this with other damage reduction sources, such as Mending or Weakening enchants, and significantly reduce the threat an enemy could pose.
A fair change to not let these stack, at least in my opinion, with this most recent change to the set as you don't want to make certain boss mechanics/attacks completely irrelevant though I'm sure others will have different thoughts.
Original Post:https://www.youtube.com/watch?v=3mjV3rsPM-U
1) Keep the Major Maim but adjust the timeframe for the proc (3 seconds to 2?) or adjust the duration to be longer and keep the same Major Maim duration if the devs think for whatever reason it's overperforming.
2) If no Major Maim, simply increase the value of the weapon/spell damage it reduces. Very very underwhelming atm with 268 weapon/spell damage reduction. One hander enchants are literally the same thing.
As it is on PTS, Vykosa is now completely useless and it feels like they missed the point of the set and took a step backwards with Vykosa compared to the other item-set updates they've carried out.