If you want to make your party more powerful, I'd replace Viconia with Anomen. The reasons why Anomen is more powerful than Viconia are explained below.
[QUOTE=Astafas]That is not my expererience. Maybe you should try to let him Grand Master in your weapon of choise, and give him a good one of those. You should also buff him up with Draw Upon Holy Might, Rightous Magic etc, as you would any Cleric. Cleric has the second best THAC0 table - if you can't hit, you do something wrong.[/QUOTE]
I agree. The main advantage in having those seven Fighter levels is that they allow him to achieve Grand Mastery. (He also has better saving throws at lower levels, but that becomes a moot point at higher levels.)
However, if you want Anomen to achieve his full potential, then you need to fix Bioware's mistakes in his proficiency point distribution. If you compare him to any other 7th Level Fighter dualled to a Cleric, you'll see that he is missing four proficiency points. At 20th Level (in other words, when he has 2,950,000 experience points), he should have thirteen proficiency points. I let him wield Crom Faeyr and Defender of Easthaven, so I give him five points in War Hammer, three points in Flail, one point each in Mace, Sling, and Sword and Shield Style, and two points in Two Weapon Style. (The next time he gets a proficiency point, I put it in Two Weapon Style.) At that level, his THAC0 is -8 in his main hand and -2 in his offhand, and he has four attacks per round. In my opinion, that's pretty nice.
For the sake of comparison, Korgan's base THAC0 is five points better than Anomen's at the same experience level. However, at 19th Level (2,950,000 experience points), Korgan only has ten proficiency points compared to Anomen's thirteen proficiency points (if Anomen's are corrected). He starts out with five proficiency points in Axes and one proficiency point in War Hammer, and he gains four more proficiency points by the time he reaches 19th Level. If you add two points apiece to War Hammer and Two Weapon Style and let him wield Axe of the Unyielding and Crom Faeyr, his THAC0 is -11 in his main hand and -9 in his offhand, and he gets four-and-a-half attacks per round. That makes him "better" than Anomen unless Anomen casts Righteous Magic and Blade Barrier, in which case I'd give Anomen the edge.
Anomen also compares quite favorably to Viconia. I wouldn't make Viconia a frontline fighter (because she doesn't have enough hit points or attacks per round), so what advantages does she have as a spellcaster? At 2,950,000 experience points, she's one level higher than Anomen at the most (he's only 64,000 points behind her), and he can cast nearly as many spells as she can. She can cast eleven 1st Level spells, eleven 2nd Level spells, ten 3rd Level spells, ten 4th Level spells, eight 5th Level spells, six 6th Level spells, and two 7th Level spells. If Anomen doesn't achieve knighthood, he can still cast nine 1st Level spells, nine 2nd Level spells, nine 3rd Level spells, nine 4th Level spells, eight 5th Level spells, six 6th Level spells, and two 7th Level spells at 21st Level. In other words, Viconia can memorize six more 1st through 4th Level spells than Anomen, which doesn't make a whole lot of difference. She does have natural magic resistance, but since her Strength is only 10, she can't wear some of the better suits of heavy armor or carry some of the better shields, and she simply can't dish out as much damage as Anomen even with the use of spells. The only other difference is the way they Turn Undead, which is a matter of personal preference, I suppose. Personally, I'd rather kill them than control them.
Before Throne of Bhaal came out, a lot of people claimed that a 9th Level Berserker dualled to a Cleric was one of the most awesome characters you could play--right up there with Cleric/Rangers and Kensai/Mages. I played a Berserker dualled to a Cleric two or three times because I liked it so much. If you think about it, Anomen isn't too much different from a 9th Level Berserker dualled to a Cleric. He's missing two Rages, two levels, one proficiency point (if you fix the other four proficiency points he's missing), and five points of Wisdom (since a Fighter requires 17 Wisdom to dual to a Cleric). But in my opinion, he's still almost as good as a 9th Level Berserker dualled to a Cleric, and that's saying something.