I didnt see anyone else with the info and I spent a fair bit of time in Karnor's (I guess cause trains didnt phase me that much...)
But the Ringed Mace of the Ykesha dropped for maybe... a month into Kunark? Maybe 2, not sure on the length. But it dropped off of the Captain upstairs in the first part of the castle. It was later replaced by the Jade Mace, which was nice... but no where near as good as the Ringed Yak mace imo. I cannot remember the percentage unfortunately. I never had one, and only seen it drop once off of him. I didnt get too loot it and I dont remember why
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My information is by memory also, sorry for no concrete proof.
Edit: It didnt drop off of random mobs, I remember it specifically dropping off of Captain. Unless it dropped off of Captain AND random mobs...? /shrug