Hello

i plan to play BGII & ToB for the third time, this time with a solo berseker dual to cleric.

At which level should i dual my berseker to cleric, knowing i'll go all the way through ToB ?

Thanks for your advices.

Id pick lvl 18. You will have a good balance between both classes, and due to your soloing, you will regain your berserker skills quickly.

whoa. dualing solo would be a challange. I dont think i would go very well suddenly becoming a lvl 1 cleric halfway through SoA

Try dualling at 13th level, so you can get the fighter class' full APR bonus as well as good hit points. If you're ever in a situation where you need more fighter levels for a better THAC0, you can cast a 4th level Righteous Magic spell.