The notes in the library rooms give some hints on how to deal with him. Each of his forms is vulnerable to a particular form of attack (e.g. when he looks like an Ice Golem, hit him with Fire spells).
Also, you want to pound him faster than he can regenerate. This is a good time to use any Whirlwind Attacks if you have them and/or cast Improved Haste on your fighters beforehand.
- Imrahil
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