Making the Crom Faeyr is worth beacuse of 3 reasons:
1- completing is quite fun
2- nice exp, get to fight some nice monsters
3- the weapon itself.
spoilers
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the crom faeyr scroll is with the black dragon in the Ruined Temple, The Girdle of Frost Giant is in a room in the Kua-Toa's lair (Underdark), Gauntles of Ogre Power (Planar Sphere) and the Hammer of Thunderbolts is in the Ilithid Lair (sewers).
I have never used Crom with Jah, though I think it would work out just as fine as if using Misnc. I simply don't give it to Jah cuz I always give her Blackblood +3. Don't knowif your party could make a decent use of Crom, but looking for itīs parts is definitely worth, using it or not
