Well the tl;dr version - it seem to not stack as of 1.6.3.

Now the long version:

I was curious if the "Major Evasion" buff and the "18% dodge chance while blocking" of the Hist Bark are stacking on the PTS giving you some fancy 38% dodge chance.

While writing this, i found out that here ZOS stated that dodge is supposed to stack. So this has to mean this is actually bugged.

Now I undestand that two abilities giving you "Major Evasion" are not supposed to stack as it's the same buff, but Hist Bark's tooltip tells nothing about the Major Evasion and with the caps removed from the game, in theory the percentages could stack - adding or multiplicative.

So I went on with some testing. Having found a mob which has one attack only (for some consistency). I let myself hit while blocking with full set of hist bark (18% dodge), with Mirage on (NB Assasination skill, gives you Major Evasion) and while blocking and having Mirage on (Major Evasion AND 18% dodge from Hist Bark)

Here are the numbers:

Major Evasion only:
200 hits
35 of them dodged
= 17,5% of hits dodged

Hist Bark only:
200 hits
40 of them dodged
= 20% of hits dodged.

Major Evasion + Hist bark:
200 hits
42 of them dodged
= 21% of hits dodged.

Now that looks like it doesn't stack at all. I mean some percent less or more is not significant as 200 is still quite a low number to test with. But for Major Evasion + Hist bark i was expecting a higher percentage, at least somewhere arond 30% if they dodge chances are to stack multiplicatively. So I tested with 500 hits:

Major Evasion + Hist bark:
500 hits
95 of them dodged
= 19% of hits dodged.

Still looks like they're not stacking.

I mean it's fine when they don't stack but then I think the wording of The Hist Bark set should change to "gives major evasion when blocking" to clarify.

You're welcome to comment on that, add your own thoughts, testings, and so on. Maybe I'm wrong, feel free to set things straight.

I'd love if someone could verify my testings and post his observations.

@ZOS_GaryA - mind dropping in here to clarify?

Greetings,

Viktor

Edit:

Tested with Shuffle, doesn't stack either.