Abilities:Stalagg: Has a thunderclap ability.
Feugen: Has an aoe mana drain ability and a War Stomp aoe that deals about 1500 to everyone in melee range.
Both sub-bosses initially stand near lightning rods. If the sub-boss is pulled away from these rods, they will chain-lightning the raid.
Every 30 seconds he will charge the entire raid either positively or negatively, and will show up appropriately as debuff icons. Every 5 seconds charged players will deal approximately 2000 nature damage to all opposite-charged players within 10 yards. Additionally, it will grant a 10% damage bonus to all same-charged players within that same range. Thaddius also has a chain lightning attack that he will do throughout the fight. After 5 minutes in phase 2, he will enrage and kill the entire raid, much like the Twin Emperors do.
Strategy:- Phase 1: Simply tank each sub-boss near where they start and dps them down. Players with mana bars should fight the non mana draining boss, while everyone else should fight the other one. Mages and hunters can outrange the mana drain, so if the groups are too uneven, then they can fill in for the missing spots. Note that they must be killed within a short time of each other, or they will ressurect each other (much like the tiger boss in zul'gurub).
- Phase 2: All players head to Thaddius himself. There is roughly 20 seconds between killing both sub-bosses and getting charged. Before the raid, assign locations for each positive and negatively charged people to stand. For example, negatively charged people could stand west of Thaddius, while positively charged players stand to the east. After the raid is charged and in position, he will randomly change some player's charge. These players have 5 seconds to make it 10 yards away from the same charged players to the other side. Players need to also avoid running through other players changing sides, so it is suggested that all players move either clockwise or counter-clockwise around the boss to avoid this. It is important to stand in 2 positions because Thaddius must be killed within 5 minutes and the damage bonus from stacking players on either side will allow him to be killed.
Healing: Thaddius doesn't deal very much melee damage to the main tank, so using only 3-4 healers for him. The rest of the healers can either heal the rest of the raid, or deal damage to Thaddius in this phase.
Tanking: Because of the increased damage players will be doing (up to 3x damage), along with the decreased rage from being hit since Thaddius doesn't deal very much damage, it may be advisable to use a bear spec'd druid to tank Thaddius because their threat generation is greater, and based on a damage multiplier, vs a warrior's threat which is damage+static threat bonus (which won't benefit from Thaddius' damage multiplier).