Big Helende
Big Helende is a High Elf thief, located upstairs in the Dirty Muriel's Cornerclub, just outside Wolverine Hall.
She is a high ranking member of the Thieves Guild, quest-giver, and medium trainer in Acrobatics, Security and Sneak for high-ranking Thieves Guild members.
"Felen Maryon has an ebony staff that I'd like to get into our possession. He's a powerful wizard, though, so getting hold of it won't be easy. He's likely to kill you. This is the only job I've for left for you, so if you don't want it, you'll have to do elsewhere for your jobs. I wouldn't even offer it, but it's all I've got. It's up to you."