You will go mad.
My Stormwind video already went over the basics of Visions.
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The Run
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[Grommash Hold] - When pulling, stop at the Shamans.
Shamans: They can summon a grip totem. Off them first.
Ravagers: SHOCKWAVE. Frontal AoE stun. Sidestep it.
Voidbound Honor Guards: Step away from the damage frontal. Interrupt or CC the shout.
GAMON BANK: Anytime you summon Gamon. Run away. Gamon will eventually stop chasing. Kill him later when you need sanity.
[The Valley of Wisdom] - You can walk past the Valley of Spirits after dealing with the Elite.
Decimator Shiq'voth: Burst down fast. Wait for your CDs. The void shot he throws out can hit twice. Instant death.
Ignore the Valley of Spirits for now.
Overlord Geya'rah: Party NPC. Annoying.
K'thir Dominators. KILL KILL KILL. There's a VERY nasty pack that has THREE of these things. After a single Void Bolt cast, they'll swap to using Call of the Abyss. This is a 5 second channel that stuns you for the entire duration. If the damage won't kill you, the stun will.
Finally, the bosses:
Coagulated Horror: Two AoEs. The blood pool, it's a meme. After the pool: an instant volley. DANGEROUS. Use ANY burst movement the moment you see it coming out. Prioritize dodging the volley over damage, or risk dieing.
Voidcrazed Hulk: Just walk through him. Make sure he is in front of you and the wall is behind you. His AI glitches out and refuses to throw you anymore. Sidestep the swirl.
Vez'okk the Lightless: Wait for your CDs. Start by standing in melee range. NOT IN THE CENTER OF HIS MODEL. Beware of any CDs that root you to the floor. It's first attack is a frontal laser, if this clips you at ALL you will die. After tthat: a few swirlies. Just move out of them.
The Ring of Chaos. Stand very close to the boss. The laser attack should be your main focus.
[The Valley of Spirits] - The fire madness takes priority. If you're on fire start walking towards a clean area when dodging.
Greater Void Elementals: Kill immediately. Has a debuff that amps all shadow damage you take by 100%. .
The boss is a joke. Don't get hit by waves. Fire madness takes priority.
[The Drag] - K'thir Dominators are scattered through the area. Down them immediately.
Annihilator Lak'hal: Preemptively sidestep before orb is cast. Don't stand in the laser.
Focus on clearing out the mobs over Gamon.
Inquisitor Gnshal: RUN AWAY FROM VOID TORRENT. Keep a decent distance from the boss and circle strafe. Don't use the tree trunk.
The shield cast: Cries of the Void. Ignore it.
Once the shield goes up, RUN AWAY. He'll use this cast twice throughout the fight. Use an orb mid shield cast if you're less than 50% sanity.
He immediately follows the shields with a Void Torrent cast.
[The Valley of Honor] - This place sucks.
Misha. Stay in the tunnel, pull her into it. Desperate Belching can be Spell Reflected but otherwise don't stand in her roar or sick puddles from Belch.
The bugs in the area apply a stacking stun poison. Dangerous.
TAKE IT SLOW. DO NOT PULL MORE THAN 1 PACK AT A TIME.
Two major mobs here:
Bonecrusher: The real threat is the knockback, it will headbutt and send you flying away. Don't get pushed into more packs.
Venomweaver: Usually the poison casts aren't a threat. But when bolstered by all the tiny bugs it turns lethal. Focus down on your initial burst or stun it.
The campfire pull is dangerous.
Stand at the bridge and range pull the Bonecrusher. This will also pull the Venomweaver to the left, that's fine. Once it crosses the bridge, attack.
The next pull. Do not cross the bridge.
Jump into the water. Swim up behind the Venomweaver. Immediately burst it down, defensives if they survive the burst.
*Aqir Mindhunter: Do not pull this with anything else. Very easy to dodge volley.
The final pack before Rexxar, wait for your CDs before engaging.
Do not rush this. You have more than enough time to wait for your cooldowns.
Rexxar: Be mindful of the traps. Do not burst this boss down, use a very basic rotation to start. Once he summons a boar, hard swap and burn it down. Same for the next boar. When Rexxar summons two boars, pop all of your cooldowns and melt them down. Rexxar should die here. If not, dodge the stampede. Easy.
[Thrall] - Thrall starts off with two boars. Focus them but be careful of Thrall's frontal laser. The only real threat here are Thrall's instant kills, he's very tanky but focus on sidestepping the frontal and stepping out of the void zones and he goes down eventually.
Prioritize dodging the frontal laser. If you have to step into Burning Bridge zones, so be it.
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Horrific Visions
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Take. It. Slow.
Do not pull entire rooms and wait for your CDs if needed.
Good luck!
Potion weakaura: 11.5 Horrific Vision Update - Pyro
Talents: CkEAO9DBjZzKcjSu6RJDto0RCqxAAAAwMzMMzMmZMz2MzMbbMGjmZWGzwYhZmhlZmxMDGGAAAAAAwAAMb2AYw22MmlllRzMDzwys1gFA