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Shocking! (25 player)
Defeat Thaddius in Naxxramas without anyone in the raid crossing the negative and positive charges in 25 player mode.
Shocking! (25 player) is a 10-point achievement earned by defeating Thaddius in Naxxramas without any raid member crossing negative and positive charges during the encounter.
Kill the Two Minibosses
Enter Naxxramas and pull the two minibosses on the platforms before Thaddius together, then kill them to allow access to Thaddius's platform.
Wait for Polarity Shift Casts
Once on Thaddius's platform, do not burn him down immediately — wait for Polarity Shift to be cast several times before killing him, as killing him before he casts it at least twice will cause the achievement to fail to register.
Maintain 10-Yard Separation
During the Thaddius fight, every player must stay more than 10 yards away from players of the opposite charge at all times; typing /range 15 in chat activates a 15-yard range checker to help players avoid crossing charges.
Tips
See the video guide for a visual walkthrough of charge positioning during the Thaddius encounter.