Need help on two quests

I have two quests that have me stumped - hoping I can find some help for my problem here.

First quest is one of the Kaineng City quests - but I don't know which. My problem is that I currently have a quest item, a chalice of corruption, in my inventory, but I can't remember who to give it to to finish the related quest. And I have no open quests in my log (nor have I abandoned any). It's not that big a deal, only it has me concerned I might be prevented from certain new quests until I finish this unknown one by handing the chalice over, so if anyone can point me in the direction of which NPC needs to get the chalice I would be grateful.

Second quest is one of the nightfall ones, where I have to meet with three princes to convince them to lend their support to the sunspears. I've only managed to gain an audience with the greedy one by giving him a vase I stole. The other two refuse to talk with me - any help available regarding what I have to do to get an audience with them?

Thank you very much for any help here

The chalice quest isn't a primary quest - so you should have no issues progressing in the game. It is weird though that it's not in your log if you didn't abandon it. I can't remember exactly the guys name you take it too. But if you don't do it, it won't affect you.

And, im going from memory, i think once you take the chailce to the npc, that takes care of that quest, and then he gives you another one to cure the disease you get? Im thinking thats the way it worked. So you would loose one quest option as far as i know.

You may also want to check www.guildwiki.org for more info on quests.

Have to go down into the undercity and kill a bunch of inffected.

For the Tihark Orchard mission; you have to go back and do some of the bonus tasks. Re-enact the battle with palawa joko; dance with the guys nephew.

Brother Tosai gives you the chalice when you complete 'Seeking Brother Tosai'. It sounds like you didn't take the next quest in the chain from him, which is either drinking from the chalice, or refusing to drink. Brother Tosai is standing next to the entrance to the Undercity, in Wajun Bazzar, and you should be able to pick up the quest from him.

http://gw.gamewikis.org/wiki/Brother_Tosai