Anyone know what the "expensive" gem you get from killing the chickens in Umar is for?

I believe you can use it to upgrade the Horn of Valhalla.

SPOILER>>>>>>>>>>>>>>>>>>>>>
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If you have the Silver Horn of Valhalla and you combine it with a diamond you get the Bronze Horn of Valhalla (don't ask why Bronze is better than Silver). If you combine it with a Beljuril (the gem in the chicken) you get the Iron Horn of Valhalla, which lets you summon the highest level berserker. Talk to one of the merchants in Waukeen's Promenade, he will do it for you.

Dunno bout this but what is the deal with farmers putting "things" in animals anyway!!!!!!!!!!!!!!!!??????????????????

Thanks!

REALLY??? i never new that... how high is the berserk fighter? cuz since i only use him when i am truely losing the battle and running away and for him to be the decoy.

Silver Horn - 5th level
Bronze - 7th
Iron - 9th