Kucica--
SPOILER
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You may be disappointed but I will tell you anyway. To get to the Underdark you have to choose a "guild" to side with (chap3) and then go to spellhold (chap4) and then to the underdark (chap5). You will not get Crom Fraeyr (however you spell it) until Chap6 when you get out of the underdark. It is a very awesome weapon and it sucks to have to play most of the game without it but unfortunately that is the way it is.
I would suggest you do the Planar Sphere quest before you go to Spellhold. The ogre strength gauntlets are very handy in spellhold and the underdark. And that way when you get out of the Underdark with the frost giant belt you can go right to Cromwell and forge the Crom Fraeyr.
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It is better to keep your mouth shut and appear ignorant,
than open it and remove all doubt!