This quest is best begun from 探索者通道.
Starting from Seeker's Passage, go southeast until you go through a narrow channel, then round the wall to your left and up another narrow channel with wooden plank steps and platforms. You will reach 席巴, the objective of this quest, at the top of the channel beside the teleporter.
If you are also doing Ancient Secrets, continue by teleporting, then move in a northeasterly direction until you find Sennat Sen, the objective for Ancient Secrets.
You need to take it slowly. You will encounter Devourers, 翡翠聖甲蟲s and a pretty large number of 風暴魔. The Storm Kin patrol in small groups but can move very quickly along their patrol routes, so it is easy to aggro more than you would like. They also seem to aggro from farther than your aggro circle, so be careful to deal with these in as small numbers at a time as possible, and heal up and recharge between encounters.