Good bosses are a tricky subject, but they are perfect for RPG's, because of the mechanics of the games. In most of them it's all about power (technically in Planescape Torment too, but the game didn't use a lot of the combat mechanics) and Bosses are the perfect tool to show how powerful you got after X hours of Gameplay.
There doesn't need to be a lot of context, but it is better for the immersion and gives the writer a reason for existing
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But I have to say, that at least the last boss in the first act was build up throughout the whole map. There where a lot of clues about what he did and how he did, so it wasn't that surprising to fight him at the end. It was a fun fight and I still grin widely when I read his lines. He's so wonderful over the top
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King Boreas (maybe even better endbossmaterial) was also very fun and I have a feeling that Bishop Alexander could be a interesting Antagonist, if they pull it correctly together. The small excerpt at the Kickstartercampaign gave me good impression of his character. At least he seems to have some guts and isn't that stupid. Can't say that about every villain in a fantasygame.
