Can you benefit from Bladesong while Shapechanged into a Marilith?

Shapechange allows you retain your Intelligence & class features, while taking up your new forms’ physical stats. In theory, this means that a Bladesinger could change into a Marilith and get 7 attacks with crazy modifiers using Bladesong, while having really high AC and Concentration saves.

However, a few questions came up:

  1. Swords Not Included™: You would need to supply 6 melee weapons rapiers to benefit get the most out of Song of Victory. How could you effectively carry these before Shapechanging, and effectively wield them afterwards?
  2. Assuming this goes smoothly, would your weapon attacks be at +11 to hit (+5 Dex due to finesse + 6 proficiency), or the Marilith’s +9 (which appears to be +4 from Str, due to longswords not having finesse, and +5 prof)?
  3. Would the damage be 6d8 + 60 for the sword attacks (w/ Song of Victory), plus 2d4 + 9 for the tail?
  4. Would AC be 18 + 5 (Bladesong) = 23 (+5 optionally with Shield) ; and +15 Concentration Saves?

Granted, it’s no Wish, but vs a handful of powerful targets (especially with Spellcasting), I feel like it could really bring enemies down quickly and hold the line, ideally if Hasted by a party member.

I’m playing a Marilith demon who is leader of a evil campaign. After hitting very high levels, how should I go about keeping the party together?

During a while of playing a 2e session with multiple 3.5e conversions, I have recently (In the past 7 years) experimenting with playing Evil campaigns and playing Monster characters such as Mind Flayers (Which I’m really good with), A Gloom (Part of an Epic Level beginning game), Baatezu, Trolls, Fairies, Sprites, Hunefers (Another Epic Level beginning Campaign), Bugbears, and a small hand full of other monsters. In this campaign, We have been going on for 2 years of gameplay, reaching levels between 64-76

Current Party

  • Nuetral Evil Medusa (Lvl 72 Wizard/ Archmage 5)
  • Chaotic Evil Marilith Tanar’ri (Lvl 77 Warrior)
  • Chaotic Evil Vrock Tanar’ri (Lvl 38 Barbarian/Lvl 34 Legendary Dreadnought)
  • Chaotic Evil Succubus Tanar’ri (Lvl 66 Bard/ Lvl 2 Rouge)
  • Lawful Evil Noble Efreeti (Lvl 20 Fighter/Lvl 48 Fire Elementalist)
  • Neutral Evil Chameleon Greater Barghest (Lvl 56 Assassin/Lvl 20 Perfect Wight)
  • Chaotic Evil Vampire Drow (Lvl 32 Blackguard/ Lvl 20 Cleric/ Lvl 24 Divine Emissiary)
  • Neutral Evil Corpse Tearer Linnorm (Lvl 60 Necromancer/ Lvl 18 Dread Necromancer)

I am having a slight problem trying to figure out how to keep this diverse group together. The blood war, the personal problems, and the ambitions in the group are causing us to be a bit nervous. Each of us is having a difficult time with personal goals. During our time we have battled the armies of heavens, slaughtered many baatezu/devils, plundered villages, battled against the forces of good, fought against the harpers including battles against Mystras chosen, and basically ravaged most planes. Now after a while of our power growing, some of us have become slightly more distant from others and others have become a little suspicious of each other, causing many to create secondary plans and safeguards just in case. I do not want this to grow out of control, for this campaign is too amazing to quit. I need a solution that does not involve a common enemy (for specific reasons) or involves money. So, how should I string together this merry band?