Melee: Damage is respectable but not particularly cheap wow gold difficult to keep healed. Chain Lightning: Every 15 seconds he'll hit up to 5 targets (8 on heroic) with this, doing about 3-4K damage on normal and 6-8K damage on heroic. Ball Lightning: This only happens if Thaddius has no players within melee range after being engaged. Polarity Shift: The only real "trick" to Thaddius but one that's deadly when raid members aren't watching their debuffs -- and everyone should have enemy cast bars enabled through the default UI or a mod. Every 30 seconds Thaddius will stop attacking and cast Polarity Shift, which is a very obvious 3-second cast. When the cast time is finished, each raid member will find themselves with a positive or negative charge. If you're close to players with the same charge, you'll gain a damage buff; if you're close to players with the opposite charge, you'll take damage, and rather a lot of it. Guilds typically designate the right and left sides of Thaddius for where to go for each charge; mine has everyone with a positive charge go to Thaddius' right, with negative charges on the left:

There is a very small 2 or 3 second grace period after each Polarity Shift where you can run cheap wow gold from one side to the other (with the fastest way being to run straight through Thaddius himself) without "shocking" fellow players, but that's all you'll get. You have to move quickly.

Tanks: Only one tank is needed on Thaddius, and he's not tough. Because you'll be getting positive or negative charges along with everyone else, you'll need to rotate him until he's facing the "correct" side. Especially if you're doing the achievement (see below), try to stand at maximum melee range to avoid accidentally shocking any melee players on the other side.

DPS: You'll see some crazy numbers on this fight due to the damage buffs you'll get from being grouped with similar charges, but more than anything else you have to watch that debuff. While Polarity Shift is charging, be ready to move instantly if your charge changes. As with the tank, melee players should stand at maximum melee cheap wow gold range to reduce the likelihood of accidentally shocking players on the other side. As a note for raid leaders watching damage meters, ranged DPS is likely to do better damage on this fight because melee will often have no choice but to attack Thaddius from the front.

Healers: Tank damage is fairly steady on this fight but not generally difficult to heal. Chain Lightning also isn't too difficult to deal with, but it does come at 15-second intervals and is a little tougher to deal with on normal as it can hit up to half the raid at a time. As with DPS players, watching your debuffs is paramount. Make sure the tank is topped off (preferably with HoT's rolling) going into Polarity Shifts in case you get some bad luck and most or all of the heal team has to move.