This is a mod that changes the Spellhold Dungeon that makes it more fun and challenging for veteran BG2 players. The mod includes three components that can be installed together or seperately. The installer will give you a choice as to what you want to install.

Before downloading, I strongly suggest that you take a look at the readme. It covers the issues that you will need to know before using this mod.

The three components:

Improved Asylum

This is, as the name predicts, the primary component of this mod.  This component will modify the asylum dungeon itself, increasing the number of encounters, increasing the difficulty of most of the fights that can be found there, and modifying some of the riddles that are found in the dungeon so as to better suit it to players who know the dungeon by heart.

Spellhold Lich

This is exactly the same as the mod which was released two years ago.  The two are compatible, so if you have an older version of the mod, then you won't be fighting two liches. This will add a lich to the library in Spellhold, right before you meet the vampire. I've been told that it's of moderate difficulty, but a fun fight. 

Improved Player Scripts

Let's face it, the original scripts that Bioware made for the game seem more akin to BG1 scripts than for the greater power of BG2.  They do not use high level spells, waste spells on weak opponents, etc.  This component allows you to select a new script for any of your mage or cleric NPCs.  These scripts concentrate on defense first and then on offense.  They will use high level spells and will not waste spells on unworthy opponents.