Yes! Saurfang’s down and you’re taking your first steps into the Upper Spire, headed to the Plagueworks.
All the trash is tied to the last boss of the wing, Professor Putricide. Since this trash is the same regardless of which boss you’re on, I’m not going to take up space explaining it on the boss strats.
Note: When you first walk in the door, there will be steam sprays. They’ll kill you. Wait for them to subside before passing through. There’s a lever visible only to stealthed rogues that turns these off.
The first trash you run into are Val’kyrs. They’re super easy, but they do spawn Severed Essences, which are basically shadow versions of a few of your raid members. They don’t generally hit very hard, so just kill everything and move on.
The Abominations come next; there are two of them. Face them away from the raid and focus fire them down, easy peasy.
Next, if you’ve done Pit of Saron, take Ick’s trash and give it a familiar mechanic. Instead of putting down slime pools, these guys work like the gargoyles back in Naxx: when they’re health gets low, they’ll start casting Blight Bomb. If they aren’t killed by the time the cast gets off, they’ll blow up people around them. Focus fire and get past these guys.
You’ll see lots of geist packs that can just be AoE’d down. There will be a colossus you’ll want to pull down the stairs a bit to avoid pulling extra trash as you get closer to the bosses. You’ll also run into a couple of Plague Scientists that are a breeze to kill.
Stinky is Gluth’s younger brother. He does a vicious aura that can’t be outranged (at least not on 25-man) and must be healed through. He also does Decimate (you remember Decimate, right? Drops you down to 1% of your health or so?), so healers need to prepare themselves. Pull him down the stairs, stay alive, and kill him.
Precious is Stinky & Gluth’s sister (I hope Precious is a “girl,” I really do). She also does Decimate. She has no aura; instead, she summons zombies. Heal through the damage, kill her, and then AoE the zombies. She also drops Precious’s Ribbon (you can see a picture of my husband’s main wearing it here).
Finally, there are traps on either side of the hall leading to the bosses, so make your rogue look for them or just keep everyone together. They spawn geists that will gank anyone who happens to go AFK after killing Precious.
Trash is down (until it respawns), so now we press on to the bosses!