You go to the onix tower and on the third level i think before you fight eldrith you fight this big mechanical guard of some sort and when you kill him you should get the onix sword
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at the mine camp you must unlock it
I'm afraid it's impossible to get the onyx sword in Dark Alliance II, but it can be obtained through item replacement using a PlayStation 2 gameshark. I don't know the code though.
The key is in the sewer in the first level of the Baldurs Gate Dark Alliance.
You first get a weapon on the level called Jailbreak. The first weapon is a crowbar, then later in the same level there is a pistol and shotgun.
Pass by save point