Necro in kaesora

[Ruien]

No, you don't pass any rooms with spiders.

From the entrance, you have a circular room where you can go left or straight. You take the left (east) path and drop down a couple of meters. There's a door in front of you and the room with spiders is to your right. If you open that door which is immediately in front of you, you'll see a deep pit. Levitate down that pit. This bypasses the spiders completely. (Just wait until the pathing spider is not standing immediately next to that pit before you descend.)

At the bottom of the pit is a single undead spawn that won't see you with IVU on, and you can just /camp off any (unlikely) aggro from any spider that may have aggro'd on the way down. This preserves your IVU for when you come back in after cycling.