I'm not running an optomized template/suit yet but I use
Double Axe (Double strike/Whirlwind)
30 SSI
45 DI
55 HML
44 HSL
50 Hit Area Cold (this is my general purpose whirlwind weapon)
Elemental damage: 40 fire, 40 poison, 20 cold
Refresh EOO if needed.
Honor pull macro
Back out of her lair and pop consecrate and Double Strike
She gets hit for 70-115 * 2
Lightning strike - 70+ dmg, possible 150 crit
Lightning strike - 70+ dmg, possible 150 crit
DS
LS
LS
Pop Consecrate again, repeat DS/LS/LS/DS/LS/LS til dead
If any minos get on me switch to momentum strike or whirlwind. Have tanked/killed 2-4 minos and miasma at same time.
If a reptalon comes, I disengage, not fighting a rept and miasma at same time.
Since miasma spawns with such a wide hp range (300-2000) she can take anywhere from 10 sec to 25-30 sec.
My hp bar hardly drops. My mana and stamina hardly drop as well.
Only if I miss EOO or Consecrate does anything drop. No chance of death, can pretty much afk kill her, I just like seeing the big hits.
I have a really nice elemental ornate I use but the double strike does more dmg I think than crushing blow.