Inside the Theater of Pain in Maldraxxus (not inside the dungeon) you'll find the Sword Sorrowbane stuck in the ground and
Рука Унара attached to it. Both of them are clickable objects so try to grab them! Too weak? Then obviously you'll need to buff your strength!
Acquisition:- Do the prequests to unlock Ау'ларринар's vendor option, buy a Зелье необычной силы and keep it in your bags.
- Buy a Сила крови from Та'тру in Revendreth and keep it in your bags.
- Make sure World Quest Небольшие трудности is active and you have plenty of time to complete it.
- Buy a Свиток телепортации: Театр Боли from Одноглазый Джоби for 10 Gold or keep your Камень возвращения off cooldown and bind it to the Innkeeper close to Theater of Pain (maybe check the location of Sword & Arm inside the arena if you haven't seen it before)
- Complete 2x ballista repairs for the WQ without losing the first buff (10min real-time, so do not log out) to get 2x Боевая закалка (second stack will refresh timer).
- Head to Glutharn's Decay at far east of Maldraxxus.
- Click 4x Съедобный красношляпникs, then instantly use your Свиток телепортации: Театр Боли or hearth back to Theater of Pain.
- Hurry up (80% slow) to get to Рука Унара within 2min (maybe you wanna use a Набор для сборки гоблинского планера on top of the stairs when using the Hearthstone).
- Use your Сила крови and Зелье необычной силы now.
- Within 25sec click Рука Унара for Рука Унара and Sorrowbane to receive Гибельная Тоска and Жнец Тоски achievement. Congrats!
TomTom:
/way #1536 51.42 48.47 Oonar's Arm
/way #1525 53.14 41.31 Teleport Scroll Vendor
/way #1536 53.63 47.93 Unusual Strength Potion
/way #1536 37 47 Battle Hardened
/way #1536 76.44 56.72 Edible Redcaps
/way #1525 51.16 78.75 Strength of Blood Vendor
/way #1536 59.73 73.02 Explosive Strength Vial