Warning against the mod:
1: It's incredibly buggy. I tried installing it, and was forced to reinstall everything just to get rid of it.
2: When it actually worked, I found another big problem. You're never going to get out of Chapter 3. Think of a messenger scrambling after you when you're out of Athkatla, and this messenger's giving you a notice to get your bottom back to your stronghold to solve some minor problem. After the mod, you're going to get 5 messengers all hitting you up at once, saying to get back to their base of operations. If you don't follow up, you could lose some or all of the strongholds.
The game gives you only one stronghold for a reason.

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Mild stronghold spoilers...
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nothing major, just general information
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I found both strongholds to be a little on the weak side. Both are over too quickly, and the cleric one is only fun if you're evil. However, if you're roleplaying a good or lawful mage, you'll be forced into making some ethical and unhappy choices.