Kol has the heretic key which of course you will need in the Serpent Temple.
I've read of other people only half talking to him before going off and doing something else in which case Kol seems to disappear. As far as I know he isn't going to reappear near the Serpent temple though he is to be seen later in the game. This is a serious problem which needs to be addressed - the game needs a patch.
I can try to walk you through a workaround if you are familiar with hexed and I can find the heretic key in my own party's inventory. Not the best solution but if you are really really really stuck and want to give it a try, email me.
Wyv
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