Delete please, my mistaque.

Durendil has an up to date list here.

Out of them I think Sarth 2D and 3D would be the most plausible encounters. Then there's 25mans and Heroic difficulties of Naxx and Ulduar, maybe even ICC. I guess Northrend Beasts is implausible (goddamn kobolds) but Jarraxus shouldn't be difficult?

Lord Jaraxxus: Killed
Interrupt his Fel Fireball when he has Nether Power active. You can ignore Incinerate Flesh. First, he will summon a Mistress of Pain. Misdirect her to your pet and kill her as fast as possible. Otherwise she will cast Spinning Pain Spike & you will take 50% from your health as damage. As second he will summon Felflame Infernal x3. Simple misdirect them to your pet and kill them. Prismatic Elixir helps alot.
Hardmode should be possible too!

Faction Champions: Not killed
Could work if you kite them. Burst doesnt works (atleast not vs. two healers)


Twin Val'kyr: Killed
Really easy. Just dont overaggro. You can ignore the rest.
Hardmode should be possible too!


Anub'arak: Killed
Use feign death to despawn Nerubian Burrower. When he is Submerged, kite him. Dont let Swarm Scarab's attack you or your pet. At around 40% i stopped doing damage and let me drop to around 40% hitpoints to decrease his healing in p2. When the boss was around 10% hitpoints i had to use a healthpot. Dont use aspect of the nature. You only take damage from Penetrating Cold. Again Prismatic Elixir helps alot.
Hardmode should be possible too!

Sadly again, I only can provide screenshots but maybe someone else can do a video.

I assume that you had to have help to get past the beasts?

Hello!

Video: Durendil vs Northrend Beasts - YouTube

The Beasts of Northrend require near-perfect execution, with a non-negligeable enrage timer, paralytic sprays and... Kobolds!

15 minutes enrage timer. It was an issue in 370 gear.
Think about stacking stamina (trinkets, buffs...), you'll need it. Health potions are nice, and engineering shield is useful too.

PHASE 1: Gormok the pet-reaver

Impale: staking DoT. Hits your pet hard.
Staggering Stomp: don't stay in melee.
Rising Anger - Increases all damage dealt by 15% (including implae). Applied every time Gormok throws a Snobold.

Snobolds:
-Fire bomb: 5K damage, then 4K per second. Ouch. Don't stand in the fire... But then, the snobold on your head isn't ok with that.

The snobold on your head: Periodically stuns you for 2 sec, "helping" you to stand in the fire, stop healing your pet, tank Gormok for a while, interrupt your dismiss pet... And lose dps.
Also melees you for less than you heal yourself. But no bandages.
To dps him, either melee him (1K dps, yeah!) or use your pet with kill command.


Strategy:
You will want 4 tenacity pets with taunt and last stand. Try to use only 3 on Gormok.
Pop rapid fire from the start, and stay out of the fires. Stack focus after about 20 seconds, and use a macro to dps the Snobold that will jump on you while you can.
Then pop your 2nd rapid fire, and dps as best as you can.
Start using CDs at 5-6 stacks, cower then shell/carapace, and ultimately last stand. Then... the pet switch!

The pet switch: As evil as always. Run away from the boss, dismiss pet, call other pet, send him to attack. Watch his health. As soon as it reaches it's maximum, taunt. Pop deterrence if needed, you might get impaled, but if you have enough health it will help your pet survive longer. Feign death, your pet will have your original aggro, so dps hard. The goal is to put Gormok at 50%, 20% then 0%
Once Gormok is down, switch pet if needed, send him on your Snobold if not.


PHASE 2: The bad and the less bad Jormungar.

They have a cone attack when mobile, and a bolt attack when rooted. Rooted jormungars while spray their paralytic poison/burning bile on you, and mobile ones apply it with a bite if you get aggro.

Acidmaw:
Paralytic Spray (rooted) - Inflicts 6,938 to 8,062 Nature damage to its target and other players within 10 yards, injecting them with a Paralytic Toxin.
Applies a paralytic toxin that inflicts increasing Nature damage every 2 sec. and reduces movement speed over time until the victim is entirely paralyzed. Exposure to Burning Bile neutralizes Paralytic Toxin. Stuns after 20 seconds unless you get Burning Bile.

Dreadscale:
Burning Spray (rooted) - Inflicts 6,938 to 8,062 Fire damage to you, coating you with Burning Bile
Burning Bile - Inflicts 3,238 to 3,762 Fire damage every 2 seconds to allies within 10 yards. Removes Paralytic Toxin. Lasts for 24 seconds.
Burning Bite - Inflicts 7,863 to 9,137 Fire damage to its target and coats them with Burning Bile. Pierces deterence.


In the beginning, send your pet on dreadscale, misdirect immediatly acidmaw, then send your pet on acidmaw. If you didn't attract aggro from acidmaw, you shouldn't get acidic'sprayed.
Now clear the 3 kobolds, and clear them quick, as to stop the fire patches from spawning.
Then dps dreadscale. When he's moving, simply dps as much as you can. When he's rooted...
Rooted acidmaw: two paralytic sprays, one after 10 seconds and another 20 seconds later. If cast on your pet, no effect. If cast on you... either taunt dreadscale, deterrence, then catch the DoT. If deterrence is on CD, better feign death for 25 seconds and get up again after the second acid spray.

Once Acidmaw is dead, dps dreadscale down. It's a good idea, when he's stationary, to put your pet on the kobold and kill command him to another life while mass misdirecting.
Then finish dreadscale off.

PHASE 3: Icehowl, final sprint!

Dps race.

Ice breath: no dps for 5 seconds. Bad.
Massive crash. No dps for about 6-7 seconds. Bad too.
Charge: get out of the way for him to get a massive 15-seconds vulnerability buff. Very good.

Dps him, heal your pet, get out of the way of his charges, then blow your rapid fires after he gets the +100% damage taken.
If you're tight on dps and lucky, he will enrage just before/after a massive crash, giving you the equivalent of 30 seconds free dps on him. But it's still better to kill him before the enrage.

Hi and good job Durendil.

I found a way to speed up the drake run on Stonecore that I would like to share.
Is all very easy to do, all we need is being in combat with all mobs in the gnome path, dps him till he emotes whatever he emotes and reset the fight.
Stonecore fast drake hunt solo - YouTube

Kilnara in ZG dead! Woo!
High Priestess Kilnara - Hunter Solo - YouTube

I'll just post this before you read the details, but I believe this is a gear dependent solo. P2 gets dangerous very fast for your pet and it'll get to a point where you cant' just mend pet your pet back up even with cooldowns.

Getting through phase 1 can be painful because of Lash of Anguish. You can absorb most of the lash's damage through pet intervene. The problem becomes apparent if she lashes before your intervene can come back up. While you can raptor strike to reduce the amount of damage from it, you'll die if this happens again. Being able to get through this phase is completely up to RNG and how many times she uses lash of anguish. Stay out of her melee range to avoid tears of blood. For the panthers, you want to pull them individually and kill them as fast, or they'll pounce and leave a DoT on you.

Phase 2 is where the gear comes into play. As the phase goes on, she stacks up her damage/haste buff and eventually it'll become unhealable even with pet cooldowns. You'll want to save any of your damage cooldowns like (rapid fire and agi pot) for this. Eventually your pet's last stand/damage reduction will fade. Right when you see her camouflage, dismiss your current pet and pull out a fresh tanking pet. MD or let it hit her, then feign death whenever your pet's health has updated correctly to full. (You might need to deterrence since it takes time for your pet's heatlh to update.) This will buy you another maybe 20-25 seconds worth of dps time on her, and hopefully she'll die before your pet.

Nice job on Northrend beasts. I spent soooo much time on that... I figured out the pet switch but kept getting paralyzed to death on the second part, and eventually gave up. You seem to be able to knock out the world firsts on bosses I've tried and hit a wall, so all the credit to you.

My question is how do you figure out the details of mechanics, like when exactly the paralyze spray will happen, etc? Are there specific patterns to look for, or are things often just random? Do you perhaps set up custom timers or use a stopwatch to try to predict when things will happen? I suppose it doesn't help that I'm not familiar with any old raid content so I'm trying to learn from scratch.

Well, there are many things to know about soloing:
-You have about 50 skills, lots of talents, 3 different types of pet with abilities and talents : Know your class. And remember, not every modification comes in the patch notes!
Usually soloing requires you to use skills you'd never use in raid - summon, dismiss, taunt, dispel... It's the main reason I have absolutely no interest of abandoning clicking.
-There are many consumables out there - mostly potions that can come in handy in specific fights.

-Finally: learn the fight
1: Get an old version of Bigwigs/DBM (or both). It doesn't show everything, but it can help.
2: spend time on wowhead/wowpedia, read the commentaries, prepare yourself. You can also use youtube for timing.
3: test it. First of all, never spend more than 2 hours on a boss - it's worthless. You aren't extremely inventive during tries, for my part I never had the idea that got me the world first during tries. A good night sleep, thinking without concentrating on anything, and ideas can pop up.
Then, learn. What pierces deterrence? What can I taunt? What can I deflect with deterrence? What can I Feign Death? What do I avoid if I take aggro? What can I despawn? What attacks won't hit my pet? What can I use at specific moments? (ex: the pet that cannot be controlled while Yogg-Saron's tentacle grips you, but that will attack it if you use kill command)

Getting a world first is, thinking, searching, getting ideas, trying, learning, making up new strategies while using the full extent of your class. That's why I managed many world firsts without ever setting foot in a Heroïc raid, keybinding, moving with my mouse or playing 2 hours a day. (It also helps I have only 1 raiding character - he gets the full extent of my play time).


EXAMPLE: Northrend beasts.

I considered them impossible - Gormok would despawn as soon as I FD'd, making pet switches impossible. But that was months ago.

Then I heard about a guy who had solo'd the other bosses. So I wondered "hey, why not try Northrend beasts?".
Then comes the "know your class bit": since Cataclysm, the pet Taunt was a 4-minutes CD 3-seconds lasting distracting shot: it didn't increase aggro, the boss would run back at you after 3 seconds. But I had also noticed about a month ago it now had a 1-minute cooldown. Maybe they had also made it a real taunt?
3 minutes and a wowhead comment reading later, I had my answer. I respecced my pets to give them taunt, then I went.
Gormok quickly fell - he was basically an unforgiving tank and spank at that point. I discovered I could also FD again - great.

Then came the twin jormungar. I quickly discovered that the snobolds were fire bombing me to an early grave, and had to go.
On my first try, Acidmaw never paralyzed me during the first static phase. So the question was, why? More testing, and it seemed that it had something to do with never taking aggro. It also appeared that dreadscale never applied burning bite to my pet.
Now, bosses have 2 kinds of capacities - the time-fixed ones, that they won't use, or that will have no effect, if they do not have any possible target (maexxna's cocoons, Kologarn's grip), and the Cooldown - type ones, where they use the ability as soon as the Cooldown is finished and they have a target (lich king's necrotic plague - or, in this case, burning bite).
So I tried 2 things: Feigning Death to avoid paralytic spay - success, he would cast it without effect - and taunting + deterrence on acidmaw. It worked because burning bite is a CD - based attack, and pierces deterrence.
Of course, after wiping on Icehowl when he was at 9K hp, I realized the berserk timer was an issue - so I used this tactic every time possible to FD the least possible.
I didn't even think up a strategy for Icehowl, just pop cooldowns when he was vulnerable.

About that: use rapid fires and pet defense Cooldowns intelligently, as to max out their effect. Macroing them in your shots isn't a good idea as far as difficult bosses are concerned. Readiness is a hell of a Cooldown because it also readies your defensives CDs - I always pop Feign death before readiness to reduce my aggro before going wild with rapid fire.

MMO-C posted a video of Mionelol soloing Atramedes on his hunter.

To be fair, Atramedes' melee damage was pretty weak in comparison to other bosses from that tier. Most of his damage was AOE damage, which isn't really an issue for our pets. Bloody brilliant kill, though.