During the Ember quest to look for evidence to save your good name, I came across a goblin cave. The goblins wanted me to clear out the giant spiders and they would give me a piece of evidence that I needed. Being a drow has its advanatages on this quest, must be race related dialogues, I met up with a magical huge spider that talked to me. I gained a 1000 EXPs for letting it go without a fight. The spider being Lolth's "child" and being a drow it was a nice set up by the devs.
Part of the bargain was to feed it. In order to do this go to Duskwood first and in a cave you will fight some baddies and they have a collection of bugs on them. You can use the bugs to feed the spider.
After my trial I had Khelgar do the fighting for me in my place in the fighting ring. He is far better fighter than me to fight Lorne to the death.