I posted some boss tips in another thread, but i'll write more here...
If you don't have PD or cupid, it's extremely difficult to permastun.
Here's why... it takes 7+ hits for a hero to proc (the proc happens
just before the 8th hit). For most heroes, who have a 1-sec attack
rate, this means it takes 7+ seconds to proc. In order to get 7+
consecutive seconds of stun, you would need heroes like:
champ = 3 secs
tg = 1.5 secs
executioner = 2 secs (4/9 skill)
immo = 1 sec
All that adds up to 7.5, which is great, but the problem is that you
must link up their stuns perfectly, which is super difficult. Adding
PD or cupid to the above heroes would make it MUCH easier to
permastun the boss, b/c your heroes will proc more often, and
will therefore require fewer linked-up stuns to keep the stun train
going.
Does heavy blow help? imo, not much... it can help you get a
stun train started if you have pd/cupid and need the help initially,
but it won't help you keep a permastun going for an extended
period of time. Heavy blow is unreliable.
Does berzerk help? Yes and no. Berzerk on pd/cupid would
help if it's a high enough level (4+ will yield immediate results,
lower levels can help if/when your pd gets 2 stacks at the same
time). Berzerk on your stunners is generally a bad thing if
you need to link stuns between different heroes, unless they
all have the exact same berzerk level. This is because their
differing attack rates will cause them to eventually get out of
sync, and you will lose the permastun. This is why i don't list
dryad in my list above, since she has a slower attack rate
than the other heroes and will get out of sync.
Does revitalize help? Yes for pd/cupid, not really for your
other heroes. When linking stuns together, you need to
account for revit to get the timing down, since heroes with
revit will proc sooner than those without it.
To link stuns together, your drop order and drop placement
are critical. In my example above, one could drop
immo first, then tg, then exec, then champ. The distance
between them should be their respective stun durations
("distance" can either be in drop times, or drop placement...
the net effect being the stun duration of the previous hero).
If you're dropping on the exact same spot for all heroes, you
could drop immo, wait 1 sec, drop tg, wait 1.5s, drop exec,
wait 2s, drop champ. Of course this assumes they all walk
at the exact same rate, which isn't true, so you need to
adjust for that. Also, if the boss' proc only hits some of the
heroes, that could mess up the stun timings as well. It's
very difficult to get this done just perfectly. While they're
hitting the boss, try to observe the energy bars, to see if
your heroes are proccing the way you expected. You should
have a few seconds while guardian angel is up to do this.
So what should you do if you don't have a pd or cupid, or
can't get a permastun no matter what you try? There's 2
options. Either use the highest dps heroes you have and just
do the most damage you can while guardian angel is up,
or try to time your drops to get as long a stun as possible
just *after* guardian angel ends, thus allowing your heroes
to get a few more hits before the boss is able to kill your
heroes.
Oh yeah, mic, you should try tanking with PD. The boss
hitting PD while GA is up will make him proc sooner. You
can try this: far from the boss, drop pd, then right behind
him drop tg, then right behind drop champ. As soon as the
boss aggro's on pd, drop your other heroes right on the
boss and hit GA.You can replace paladin with executioner,
and add exec to the train of heroes. Or you can play
around with the drop order... maybe dropping champ right
on the boss. Experiment and see how long of a stun you
can get.
The above represents my understanding of the game
mechanics, but of course i could be wrong. I encourage
feedback and comments... by sharing information and
ideas, we can all get better.