I am not a good player, so please take this with a pinch of salt:
I have succeeded with a team, but it's not possible to solo Ascension! I am at Insane level, if you must know. Rather insane, come to think of it.
Anyway,
Let's see, you have 2 characters that can't be time stopped, so you will be cut down pretty fast after using up your spells if you are a magic user. And besides, can you rest? As it is, you barely have time to set traps without getting hit if you are a thief. Fighters might last a little longer against THAT bunch. But not much longer.
@nightshift001
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Here's how I did it with my party. I didn't take Balthazar or anyone else. As you can guess, there were countless reloads!
1. Me - monk with fists, Ring of Gaax, Gauntlets of Crushing, Big Metal Unit (I got it the honest way - not much help though as I still get hit with AC of - 20 something! Go figure)
2. Aerie with Robe of Vecna, Amulet of Power, Sling of Everad, Staff of the Magi
3. Keldorn - Casomyr
4. Jan Jansen - Staff of the Ram
5. Sarevok with Ravager (switched him in place of Korgan; one word: Deathbringer). Note: be sure to turn him good, otherwise he will betray you like the brother he is.
6. Minsc (and Boo) dual wielding Spectral Brand (sp?) and Celestial Fury
This is not a magic heavy party because I knew melee is about the only way to get through the battle. And I was right. Most of the characters are immune to pierce magic or breach anyway. I tried those on Abazigal and they didn't affect him one bit. Either that, or I must have done something wrong. Oh well...
Pre-battle: the usual buffing up with stoneskins, potions and the like.
It: Summons! Lots of them. Solars help a great deal. Set Keldorn and myself on Irenicus right away. Dragon breath him with Aerie to soften him up. (and the Fallen Solar). The rest of the party (and summons) gang up on Bodhi.
Next; the Famous Five. All at once, which is a bit much to take. The priority is to get rid of Sendai first with her Time Stop. The annoying thing is, Balthazar is immune to that and he tends to kick butt, stun and quiver palm my party to death while they stand rooted. Have Jan Jansen set traps (admittedly he's lousy at that, but well, he has to make do) - killed Yaga watzisname and Grommy that way.
Meanwhile, summon more cannon fodder and don't hesitate to run around and drink potions while you are at it. Recycle a few times and I (finally) did them. I lost Sarevok thanks to Balthy, with the rest of the party badly injured.
Amelyssan: The mother of all battles. This one really takes the cake. She appeared after Sendai went down. I saved half of my Greater Whirlwinds just for her and it was still tough.She summons Cambions, bateezu and Fallen Planatars as if they come from the horn of plenty. My own summons died very quickly from this onslaught.
Keldorn with Casomyr disrupted a few of her spells while the other two tanks pounded her. Jan joined in the fun by wacking her with that Staff of his when his traps ran out. He died honourably in one of her Time Stops. Aerie casts Lower Resistance, Meteor, Horid Wiltings and unloaded the kitchen sink on her. She also helped my party with Regeneration, when I ran out of potions.
At long last, she died from a Critical Strike from my Monk. A fitting finale.
But man, this was tough!
Solo? Jerion, I wish you good luck!