The Miniquest Lair of Tarn Razorlor. Boring as fuck, not interesting, and you have to restart about fourty times from trap failures. All to Enchant your Salve Ammy. I tend to really hate quests that have must-have things locked behind them, like the previously mentioned and The Fremennik Trials. Unlocking Fairy Rings was pretty terrible, but at least like Fremmy Trials it's not RNG-based how long it takes, it's just the items you have to get the Necromancer.