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Rubble and Roll (25 player)
Defeat Kologarn after causing at least 25 Rubble creatures to spawn in 25-player mode.
Rubble and Roll (25 player) requires defeating Kologarn after a cumulative total of at least 25 Rubble creatures have spawned during the encounter in 25-player mode.
Enter Ulduar and Engage Kologarn
Enter Ulduar and engage Kologarn. To avoid his Stone Grip ability despawning him, destroy his right arm immediately at the start of the fight.
Kill Arms Repeatedly
Each time either arm is destroyed, 5 Rubble creatures spawn. A destroyed arm respawns after 15 to 30 seconds, so you need to kill a total of 5 arms across the fight to reach the 25 Rubble threshold.
Kill Rubble Adds Quickly
Rubble creatures melee for 4, 000 damage and cast Stone Nova, which applies a stacking +5% damage modifier, so kill them as soon as they spawn — they do not need to remain alive for the achievement, only their spawn counts.
Kill Kologarn After 25 Spawns
Once at least 25 Rubble creatures have spawned in total, kill Kologarn directly — dealing enough arm damage to reduce his health to zero via arm kills still counts, but deal at least some direct damage to Kologarn himself to ensure you receive kill credit and can loot the chest.
Tips
Do not kill Kologarn exclusively through arm damage without ever directly damaging him, as the game may not register you in combat with Kologarn and you will lose kill credit and loot access.
See the video guides linked for a visual walkthrough of the arm-kill rotation.