I was already powerful at the end of BGII: SoA. How exactly will I become even more powerful in BGII: ToB?
As you character advances above the BGII experience cap, they gain High Level Abilities and Spells according to their class. For example: a fighter might gain the ability to perform a Whirlwind Attack, an ability that temporarily sets the players Attacks/Round to 10. A mage, on the other hand, would have access to super spells such as Improved Alacrity, which essentially sets the casting time of all of the mage’s spells to 1, allowing him to cast several high level spells, one after another, without pause. A thief could gain the ability to scribe and use scrolls and mix potions. A cleric might gain a powerful new spell called Storm of Vengeance, a spell that causes the earth to shake and the heavens to boil with blood and energy. All enemies of the caster are stuck down by acidic rain, earthquakes and lightning.