Delia has my Dawnforge book, so you'll have to talk to her about the skills for the legendary paths.
What currently do you have on Khartoom so I can speak more authoritatively on adding stuff to it?
Yes, you have a legendary item at every 5 levels up to 20th, so by 21st level, you should have 4 items.
Everyone, you have 635,000gp to spend. For those of you with weapons, now would be a good time to think about making them epic. You're going to kill an immortal, and you need more than ordinary magic. You need Godkiller weapons, essentially. You know he's a frost giant and also a dragon. Bane weapons of that type could be good. Contingency healing items (like perhaps contingency heal) would be very excellent to avoid another Hisss incident.
Check page 285 in your DMG (and read all of that table thoroughly) to see about creating different types of items or adding things to items. If you need the Epic Level Handbook, I'll bring it over to Forgefly's house today (if we're still on).
Our next gaming session is looking to be sometime in December, depending on when Verlomi returns next from the Windy City. And when everyone gets their character done too. Putting them up in the Rogue's Gallery might let everyone pick over people's character sheets side-by-side to help us all avoid mistakes, redundancies, and perhaps make more advantegeous suggestions.
Forgefly, I don't think I wrote down everything Darvekis got from that last treasure-picking session. Could I get that from you?