Idea for a unique quest item bonus

[WhYdOyOuThInKtHaThApPeNeD]

All welcome to add to the list


How about a mid to mid-late game quest that always gives you a fixed special reward. Perhaps an item that while not equipped has a really hard keeper fight to obtain the bonus. Or a multi-stage quest like the Axe of the Elements where one obtains the different components to brew a special potion that allows you to choose 1 of your skills such as Voice of the Dragon, where that chosen skill is then open to be upgraded to level 5 (of course it still needs to be upgrade with costly runes). Any of the skills can be chosen but only 1 for the whole game. Adds a unique variable for replay value and discovery of what benefits the further upgrades provide in each skill.

I'm thinking a magical living witches cauldron that is really anti-social but when suppressed after a really difficult fight becomes helpful and instructs you on the different places to go and things to do to get the ingredients to brew a special potion.