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School's Out Forever
Defeat 50 Expired Test Subjects within 20 seconds in Scholomance on Heroic Difficulty.
School's Out Forever requires you to defeat 50 Expired Test Subjects within 20 seconds in Scholomance on Heroic Difficulty, and cannot be completed without a full group of five players due to how the boss mechanics function.
Form a Full Group
This achievement requires exactly five players — the boss will not teleport solo players or small groups, making a full party of five mandatory. A confirmed setup that works is a Protection Warrior, Affliction Warlock, Elemental Shaman, Fire Mage, and Holy Paladin.
Tank Boss in Center
Have the tank hold the boss in the middle of the room where he spawns. The boss casts Harsh Lesson on a random target (including the tank) approximately every 45 seconds, which teleports that player into a private room containing 10 Expired Test Subjects.
Kite Adds to Healer
Have the healer use Righteous Fury so that the Expired Test Subjects automatically aggro onto them, then kite the adds to the upper part of the room. DPS should stand halfway up the stairs and apply damage-over-time or chain effects to the Failed Students to prevent them from overwhelming the healer.
Wait for All Teleports
Wait until all five party members have each been teleported into their individual rooms via Harsh Lesson before attempting the achievement. Group up at the last member's door and wait for it to open so all 50 Expired Test Subjects are clustered together.
AoE All 50 Adds
Once all 50 Expired Test Subjects are grouped, AoE them down within 20 seconds to complete the achievement. DPS should stop attacking the boss at around 20% health to ensure the healer gathers all the adds before the burst window.
Tips
See the video guide for a visual walkthrough of the positioning and teleport sequencing.
If a party member has Explosive Pain debuff after the add burst, dispel it immediately to avoid deaths that could interrupt the kill count.