Your memories on the Ice Temple Challenges, Was weird Options

[Baronius]

When playing the game first time, I did not finish the challenges, they were too hard for my party.
I beated all turns of the challenge when playing IWD2 next time, although the last battles were won later: when having enough power, I returned to the Ice Temple and destroyed the last creatures (usually Remorhaz, Glabrezu or Frost Giant if I remember correctly, but the list might not be precise since I played IWD2 long time ago)
But there was no final prize! Meanwhile I got better and better things but nothing like 'you have completed the whole challenge etc.' or such...

An IWD2-bug related with this part of the game: sometimes the creatures that could teleport themselves teleported out from the fighting chamber to somewhere else, the party followed them somehow, so the whole thing ended in a stupid situation, the Golem did not let you to continue the challenge etc. Only reload helped. This has happened several times.

Do you remember how it went for you? Was it easy or hard? Did you finish it, and get something huge prize or XP at the end?