Sorri, just realize I cant edit it.
Anyway, my character is that, a human dual class where I have a few tweak here and there, but defeating those monster in the last battle is still my skills and lucks, something to share.
Tweak: XP remover, grandmastery effects, infinte stack, all stats 18, level 50, ring +2 from item mod, acid katana from tactic.
Tricks: Actually, during the last battles with those fives, I manage to save my game twice half way. Once, after I kill illsene and Gormir, Meilssen came out to fight me, but halfway through the battles, she and the fives end up getting stuck in the intersection on the way to the right bottom platform, that's how I manage to save the game. After I manage to kill most and left the fire gaint, I keep pressing quick save to save the game when they out of sight, so it's alot of luck with a little tweak here and trick there.
Killing Orders:
Tougher Gromnir
Tougher Illasera
Sendai
Saerevok
Abazigal
Tougher Yaga-Shura
I didnt kill Balthazar, manage to convice him to my sides.
I remember alot of stoneskin, improve haste, time stop, a few wish spell. Before the battle, I cast whatever spell I have, the important thing is I have that acid katana from tactic and that +5 katana that item upgrade have. dual wield them, before the final battles I run to the bottom right, cast time stop and kill Gromnir, cast another and kill Illasera. After that, Meillisen appears.
That's when my luck is, I run out and back to bottom right and realize that get struck at the top, I save the game and cast a wish spell. I got back all my spell and then I cast time stop again. Save game, went out and try to run and hit Saerevok. Kill him easily with strenght boost by strom potion, two katana, potion of herism and improve haste where my att/rd is 9.
Then I cast more time stop, kill Sendai follow by Abagazal which aint easy. u really need those time stop spell, buy them if u can and dont be afraid to use them. Once u manage to get rid of those two spellcaster, u safe. They very dangerous to hang around esp Sendai like to cast spell like creeping doom that's very irriatating, with meillsen around to bleach u, it's aint funny. Finally, Yaga shura is easy. My katana keep stunning him, if u got Greater Malison use it.
Finally, when all is down, Mellisan is easy meat since she cant move around. u can hit and run, hit and run and heal yourself. thus this mean that stack alot of potion, it do u good.
Spell: 5 time stop, 6 improve haste, 2 true sight, 2 wish, 3 spell turning, 9 mirror image, prot from element, prot from energy.
Apparently, most offensive spell dont work good, it's a waste of time too. In the end, I kill everyone with the katana and few good spells.
Item: that 2 katana I mention, aumlet of power, venca robe, cloak of deflection, boot of speed, gaxx ring, improve ring +2, lot of healing potion, potion of strom gaint and hersim.
Other mod I have: ease, item upgrade, tactic mainly for some of their tweak and weapons.
Hope this help members who want to try solo, basically this works only for fighter/mage. I cant imagine a mage or fighter to win the fight alone.