You start getting the high level abilities when the characters in your group reach 3 million experience points. If you have multiclass or dual class characters, add up all the experience for all the classes the character has. If it's 3 million or more (for the same character), they will get a new ability each time they level up, starting at 3 million points. Some high level abilities can't be selected straight away, such as Greater Whirlwind, you have to pick a lower version of that ability (Whirlwind) before you can pick it's stronger version (Greater Whirlwind) at the next level up.
There is one item you find in SoA that can be upgraded in ToB, the Flail of Ages (found in Nalia's Keep). Every other upgradable item in Throne of Bhaal is found in the Throne of Bhaal areas. If you have ToB installed already, the area called Watchers Keep is actually part of ToB, but you can explore it in SoA. If you start exploring Watchers Keep during SoA, there are several items from there which can only be upgraded after you finish SoA and start ToB. Keep all the weapons you find in Watchers Keep and make sure your group is carrying them when you finish SoA. Once you finish SoA, you can't go back to your stronghold to pick stuff up that you stored there. Also hang onto high value gems like rogue stones, kings tears and sapphires. Some items use these gems for their upgrades (although you'll find more of these gems in ToB).
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