Kel'Thuzad

[Lolretadin]

No way. Yogg fed upon death, and Scourge prevented life and death from circulating. IIRC, there was even a quest in Icecrown in which we unchained a Faceless One so that he wreaks havoc upon Scourge.

1) There's nothing substantial to say that Yogg-saron "fed" upon death, that's speculation based in nothing.
2) R'khem was chained by the Ymirjar that the Lich King had told to mine, he came up to find what the disturbance was. He doesn't even "wreak havoc" on the scourge, as you put it. He just runs away after you release him.
3) The scourge was indirectly involved for the releasing of the Faceless Ones.

[Haven]

1) There's nothing substantial to say that Yogg-saron "fed" upon death, that's speculation based in nothing.
2) R'khem was chained by the Ymirjar that the Lich King had told to mine, he came up to find what the disturbance was. He doesn't even "wreak havoc" on the scourge, as you put it. He just runs away after you release him.
3) The scourge was indirectly involved for the releasing of the Faceless Ones.

My bad. Must've been under impression from all those speculative threads about Old Gods' nature. Anyhow, there's seen some animosity between Yogg and the Scourge. From http://wowpedia.org/Yogg-saron:
"Alliance questing revealed, however, that the undead of the Scourge mysteriously utter the name "Yogg-Saron" with tremendous hatred and contempt"
"Blizzard representatives have stated that they feel the connection between Yogg-Saron and the Lich King ended up being poorly expressed in-game, but added that it "had a lot to do with the ability for mortals to become corrupted."

Considering that undead couldn't be corrupted like mortals, and that Scourge used the maddening saronite without any repercussions for them, I'd conclude that Yogg didn't need them in this world, as they were like useless weed to him.

[Whales96]

Since when did people start asking for expansions that were just rehashed content? Scourge 2.0? Seriously?

[fenixazul]

What? do you want the Iron Scourge?

[Deleted]

Think that guy has come back enough times already.