Can't say I ever really cared for the hero's party so far but seeing the long-term effects our little spider had on this world was fun. Having entire passages of the dungeon impassable, not even because of her but because of her Vestiges? Awesome!
I was curious about that as well! Maybe she created them as some sort of "vessel", since (beginning at around 20:18 in this video) she's seeking for a way to reincarnate in case the demon lord destroys her soul? It's going to be interesting for sure! :D