Ok I soloed a Kensai through the game so I can tell you straight up it isnt that hard let me give you an example of what my kensai from bg1 as well was like near the end.
Str 21 tome in bg1 and evil path
dex 20 tome bg1
con 19 tome
int 18 tome
wis 9 yes I know a bit of a dissapointment
Cha 11 ok hes not very friendly but with items it goes to 23.
His thaco was -20 mainhand -18 offhand varies due to weapon. On average about 30-40 damage a hit.
His Ac is your problem ok with 18 dex the base is 4 ring of Gaxx brings it to 2 ring of protection+2 brings it to 0,cloak of the sewers down to -1 and there is an Iou stone brings it to -2. Now here comes the hard bit the item juggeling ,arly in the game you can these next items the various belts of piercing bluntness and golden(slashing) which will lower you AC versus these weapons so if someone attacks you with arrows girdle of piercing goes on to bring your AC versus the arrows to -6 or so the cloak of displacment will lower it again so its not that hard.
The Kensai is devestatingly offensive you ust have to manage it right, if you need more help ask. Oh yeah he dosnt wea armour but as I shaowed you he dosnt need it.
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