Disarmed!

in Dalaran City wants you to return the Severed Arm to her.

• Severed Arm

I've received word of an unfortunate accident at the Dalaran prison; a guard had his arm severed and thrown into the water by a particularly vicious inmate.

Our first aid clinic promises they can reattach the arm if we bring it back.

You fish long enough in the water outside the prison, and I'd bet my favorite fishing pole that arm will surface. Find that arm, and bring it to Olisarra the Kind here in Dalaran. She'll know what to do.

Hi there. Do you have something for me?

Oh, hello there. Marcia said that you'd be coming by with that poor man's missing arm.

She also gave me this bag to give you as a reward. It smells horrible, and I'm anxious to make the trade if you don't mind.

• The arm is inside a Bloated Slippery Eel
• Disarmed! was previously Monsterbelly Appetite and required a trek to the Frozen Sea south of Northrend.
• This quest is part of the achievement.

Among other items that can be fished up during this quest, you will likely get some and possibly a Rusty Prison Key.