Tumble past the Marillith on the right side (not through it). Due to Dervish "movement mastery" can take 10 on the tumble check:
10+16=26
Provokes no AoO
Initiative: (1d20+9=27)
Primary Hand Attacks 3x (Bane: Evil Outsiders)
1d20+22=40
1d20+17=33
1d20+12=23
Secondary Hand Attacks 2x (Keen, Ghost Touch)
1d20+22=33
1d20+17=21
(Forgot to add the +2 Enhancement for Bane. I will add that in after rolling, making the attack rolls for bane weapon: 42, 35, 25
Critical Hit Check from Bane Scimitar (18)
1d20+22=35
Dang it, again, forgot the +2 in the roll.
Makes the total: 37
Critical Hit Damage
3d6+19=32
3d6+19=34 = 66
+4 Damage for Favored Enemy
+5 Damage from Dervish Dance
+2 Enhancement Bonus from Bane
+2d6 Damage additional from bane
x2 Crit multiplier (2 rolls)
Additional Bane, Non-Critical Damage:
(assuming ALL hit, though I think only 1 actually does
3d6+18=24
3d6+18=30 = 54 (only
24 hits, I think)
Non Bane Scimitar Damage:
1d6+17=20
1d6+17=22 = 42 (though only
22 hits, I think)
2 Weapon Rend (1d6 + 1.5x Str Modifier)
1d6+9=11 = 11
Total Damage that actually hits, before any DR:
66+24+22+11 = 123
(3 hits and Rend damage)