i suppose, like all things that are useful in normal- becomes useless in ultimate, i wonder when does the stun become one? is it even possible to stun somebody longer than half a sec? Most of the mobs even in normals cant be stunned longer than that…
also, is there any other means to increase stun duration other than bull devotion?
Anyone? 
As any other cc it all depends on mob related res ( in this case stun res) obviously the more you go ahead the stronger the mobs and their res (generally speaking). That said i would not say stun is useless in ultimate, on trash packs and some heroes it actually works.
Oh well, forcewave and thunder smash deals pretty good dmg anyway…
Is there a way to increase stun duration without the bull devotion?
I wouldn’t tailor my build focusing on it. Just use what you already have in store and focus on core stats. Stun enthusiast often use canister transmuted, if you really like to stun stuff…
As far as I know, bull devotion and rhowan’s mace devotion are the only 2 areas that increase stun duration unless it’s an affix rolled on specific pieces of gear? I haven’t really checked the newer devotions yet either.
oh, Arbiter relic also gives Stun duration, +28% in fact, but im not sure if its to all stuns or only that relic one… its stated as a normal +, not in the “active skill” section…
question: is the arbiter skill aoe? or a single target? (i guess its a single, but want to be sure)
anyone? 
Don’t pay attention to Stun Duration.
The only thing related to “Stun” that is important is its resistance. Increased Stun Duration is useless against bosses, but reduced stun resistance is useful against them :rolleyes:
Arbiter is an AoE skill. It’s animation is slightly different than Forcewave (Soldier skill)
Thanks, glad to hear its an aoe…
tried to google “reduce stun resistance items grim dawn”, found 0… any suggestions where i could find such items/ upgrades?
(edit: except the “Luminari Regalia set” which is 94 lvl and is for inquisitor… 
)
Typo on my end I mean Reduced Stun Duration i.e Stun Resistance
so theres no way to decrease stun resistance of mobs except that set?
Arbiter is a relic, and it only adds to stun duration, it doesn’t reduce stun resistance. As far as I know, nothing in the game reduces stun resistance.
Having said that, stun is not terrible to have if you like the skill or constellation anyway, it’s just not worth putting much focus on it.
I looked at resists of selected heroes/bosses etc the other day, Super Bosses are 500% stun resist, nemesis are all 170%, every named boss is 100% or higher, other elites are generally around 75% but some are at 100% or higher, too.