Ooners Arm companion pet

A Few Bumps Along the Way world quest
A Few Bumps Along the Way is needed for Harvester of Sorrow achieve and to get Ooners Arm companion pet
The Sword Sorrowbane is stuck in the ground just inside the Theater of Pain in Maldraxxus (not inside the dungeon) and Oonar’s Arm is attached to it.

You need a certain amount of buffs to give you the strength to pull these out
One being the Battle Hardened buff that you get during the Few Bumps Along the Way world quest
Location: Maldraxxus ,west of the Theater of Pain
plus –
1 x Strength of Blood
1 x Potion of Unusual Strength
Eat 4x Edible Redcap found on the ground near the Deadly Dapperling rare. (duration 2 mins and they will slow you down) /way 76.8 57.0

Heres what to do –
Bind your Hearthstone to Slumbar Valorum at Theater of Pain in Maldraxxus
Buy “Scroll of Teleport: Theater of Pain” from the vendor named One-Eyed Joby (towards the northeast side outside of Theater of Pain).
Buy Strength of Blood from Ta’tru vendorLocation: Revendreth, Price: random crafting material, changes each week
Buy Potion of Unusual Strength from Au’larrynar vendor Location: Maldraxxus, east of the Theater of Pain Price: 35g
Then -Do the WQ to Get 2x Battle Hardened buff (duration 10 mins)
Hearth to Theater of Pain , go quickly to Deadly Dapperling rare. /way 76.8 57.0
Eat 4 x Edible Redcap, (on the ground near the Deadly Dapperling rare. duration 2 mins and they will slow you down)
Use scroll of teleport Theater of Pain (this puts you almost beside the sword)
Click on Oonars arm
Drink strength potions and pull out sword

Reward is Sorrowbane and also Oonar’s Arm

Video from youtube https://www.youtube.com/watch?v=FC9f3pKkjxk…

Info from Wowhead