finished madness with:

Visions (Angel, enegy) forst attacks
Pharaoh (Quake) for damage and stun
and sometimes B.Breeg (Eternals) or Phantom (Eclipse) for sleep/revive/damage shields

my toons were:
Sentinel Derby Demon (Titan shield and immortal) and
the prisoner (primordials)

If the right effects (specially crit) trigger on the primordials it's a walk in the park with this team.
Derby demon does loads of damage and pharaoh's quake is also pretty heavy.
Had to revive only once (or twice?) during the final battle, cause the end boss will kill you at first hit. (it was with the beast madness on first try the same), but now that i got the killer, i'm done. For farming i still use powerslave. It was a fun addition.