Clever Use of Mechanical Explosives

I think it's noteworthy to mention that you must engage the [npc=136189] before using the [item=163558]. If you use it out of combat, it will not count towards Clever Use of Mechanical Explosives.

this is a throwback to Ensidia

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taken from MMO-Champion: 2010-02-04, 03:45 PM
Ensidia suspended for 72 Hours
A few hours ago, all the players involved in the Lich King 25 world first kill of Ensidia had their account suspended for 72 hours, Gamemasters also removed the achievements and loot acquired during yesterday's raid.

Date of Violation: 03/02/2010
Type of violation: Exploitation – Abuse of in-game mechanics or glitches with intent to exploit or cheat in World of Warcraft.
Details: Use of Saronite Bombs to bypass The Lich King fight mechanics Consequences for Account: Account suspended for 72 hours, all items and achievements gained removed

First, it seems that the bug was caused by a single rogue (always blame it on the rogues!) who used [item=41119]s throughout the fight. Apparently the siege damage caused by the bombs bugged the encounter's mechanics and respawned the platform destroyed by the Lich King during the encounter.

It results in the fight being fairly easier because you end up with more room to move and more importantly, you do not have to care about Valkyrs taking away your raid members anymore. (They will just land on the rebuilt platform when they fall down)

Thought I'd add a new comment for visibility. Thanks to hub2000 for bringing his find and info to our attention.

After tonight's hotfixes I found the [item=163558] at 23.3, 75.7 in Stormsong Valley. It can be found just like the other truffles in the zone by first using a [item=162000] and then searching under trees for the clickable Truffles

Screenshot of what the Truffle looks like: https://imgur.com/a/M3lwIYw (it's a little dark because of the area - but it's right above my green soul shard)

Screenshot of the loot and map location: https://imgur.com/a/3V85uPU

After you have obtained the Bomb, simply run to [npc=136189] rare at 51.8, 79.2, engage him in combat and use the Bomb on him to obtain the achievement Clever Use of Mechanical Explosives.

Proof of achievement: https://imgur.com/a/lb8CmEa