I've read it.
Quick overview -
Big fight - Slayers getting chopped in half. Willow chants over the seed. Buffy and Angel fight; they seem quite evenly matched. Spike attacks Angel. Angel takes Spike up into the sunlight and tries to kill him. Buffy flies up and knocks them apart. Spike's ship flies forward to catch their smoking captain. Angel throws a misile to the ground killing a lot of people (army and slayers mostly).
Angel and Buffy continue to fight. Buffy gets slammed into the ground. Xander sees what is happening and realises "We're not going to win this"
Andrew teams up with the earth-bound demons against the invading demons. Buffy and Angel continue to fight. Andrew sees a big dragon-type demon approaching and warns the slayers to get out of the way but he only succeeds in rescuing the red-head scottish slayer (Leah?) while the rest get incinerated by the dragon's fire breath.
Willow is really powering up on the seed. She glows red then transfigures out to where the fight is happeneing. She causes a huge tree to grow up out of the ground, spearing the dragon. Trees sprout up everywhere and Willow uses her magic against the demons making them explode - she's cross because they didn't just attack "little things that crawl on the outside of the earth...[they] attacked Mother."
Willow then begins to fight a big floating demon that looks a bit like female genitalia (i'm sure this is supposed to be symbolic) Angel says, to Buffy "You're friend thinks she can win this fight. She's missing the point" then kicks her down. Buffy flies back up but is more concerned where Giles is.
Giles watches from a distance then goes to get the scythe off Faith. He tells Faith to lead the girls but that he needs the scythe for Buffy. She hands it over. Giles runs off with it and Faith is attacked by an electric demon (what is this, pokemon?) who causes Faith's troop of slayers (and soldiers) to literally melt. Yup, that's another big group of slayers dead.
Amy and Warren are lunching in Rome. Amy wonders if they should have stayed to see how it ends. Warren thinks not.
Xander goes into the seed cave. Willow says magic spells over the vagina demon. Kennedy and Andrew watch from below and Andrew observes that the demons are winning.
Buffy and Angel are still fighting. They crash through to the chamber of the seed. Angel says "you created a world. you can't turn away from it. You were Chosen Buffy." The Master Says "That's original." Angel punches his fist clear through the Master's skull. He turns to dust.
Giles arrives and finds Xander watching the action from behind a wall. Giles asks what he is doing there. Xander implies that he was going to try and do something (what, I don't think even he is sure). Giles says there is nothing they can do, "Their power fades in proximity to the seed...but the seed fuels the scythe..."
"So throw it to her!" says Xander
Giles replies "Xander, I's Angel. At the very least she...she'll hesitate. She wants to stop him...not kill him."
and then Giles takes the scythe into the seed chamber. Xander tries to stop him but Giles can't be dissuaded.
Giles steps inbetwwen Buffy and Angel and Angel rushes forward, says, "You abandoned me for this?!" then snaps Giles neck in classic vampire fashion - quick and brutal (and just like he killed Jenny calendar). Angel stands over his body and says "When they're all gone you'll understand."
Buffy is shocked (and I mean shocked) as is Xander. Buffy knocks Angel down with a huge BAM, grabs the scythe and thinks 'No More' and smashes the seed.
Breaking the seed causes a great flash of light that shocks Buffy and Angel and causes Willow to grab her head and fall to earth. The remaining Slayers look on in shock. Amy and Warren feel it too. Acctually, Warren more than feels it - he disolves into an squishy mess.
Willow is traumatised. She cries out "No! Goddess?! What... Where!?" while all the non-earth bound demons are sucked back into the portals through which they came. The New York wiccas lose connection with sunnydale - I think they might have lost their magic. Kennedy runs to Willow who is still desperately calling for Aluwyn. Kitty Twilight is seen walking away (i'm not sure if this is on earth or in 'Twilight' dimension).
Spike order's his ship be put into reverse to avoid being sucked into "hell" with the retreating demons.
Bug one says, "Your friends, your majesty, they did-"
Spike cuts him off, "She. She did it. Slayer, you did it." He is about to land and see who need help when he spies Willow's vagina demon fleeing the scene so he decides he better stop that first and flies off after it.
On the ground, Willow is inconsolable. She says they lost and that this is the end. in the chamber of the seed Buffy is prostrate on the ground, crying and gripping her stomach (just like we saw in Anywhere but Here). Giles is dead beside her. Angel steps forward - I think he touches Xander but Xander shrugs him off and goes to check on Buffy. The Slayer Scythe is broken in the foreground.
End.
Next: Coda...