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For me, the biggest wow moment I had was when I was exploring and climbing around a ridge. I goofed up and got too close to the edge.
I fully expected to fall to my death, but I landed on a tiny tiny ledge and was at ONE HP.
Standing there in amazement, I looked at where I was.
I had an unbelievable vista of sky above and land below.
Forests and ruins could just barely be made out in the distance, and nearby (though unreachable) on the cliff wall were waterfalls cascading from one pool to another.
I had a screenshot, but a hard drive crash wiped that out. It's amazing what is in the game I don't think they expected anyone to ever see, as this was before Burning Crusade. I've looked for that teensy foothold on the cliff many times since, but still haven't found it. Maybe someday.
Lost my mind, now trying to lose yours...
I remember the first time I explored/discovered Caverns of Time, it was together with a very special girl + someone I don't remember (no-one important to me at least). I was actually level 60 when I first went in there to look! I was really amazed when I went in there and looked around.
I was so lucky to have uploaded old screenshots to my abandonded x-fire account, luckily I still remember the name to it.
Even by this day I'm still astonished at how it looks!
My favorite "wow!" moment... I'm a little disappointed because it happened a little over a month ago; it's not from the old days... but it's when my group finally completed Challenge Conqueror: Gold. When I first heard about Challenge modes, about how they're the toughest PvE content Blizz has ever created, I wanted to do them. I knew I did. They sounded very hard to get Gold times, and I wanted to get those times.
Months pass, MoP hits, and at 90 I form a challenge mode group with some friends I met cross-realm. We stepped into our first Challenge Mode: Gate of the Setting Sun. Got destroyed our first time and finished in a 45 minute run. However, we kept running the place several times over the course of 2 days, improving every pull, timing CDs better, getting blessed by the RNG gods more and more each time... until we finished at 12:23 and snagged our first Gold. I was exploding happy.
We went on to Scarlet Halls and snagged that Gold within a few hours of attempts. We smashed the Scholomance Gold time easy, and then got destroyed by the annoying rail jump before the second boss in Mogu'shan Palace. Once we finally got that Gold, we finished the rest easily... until we came to Stormstout Brewery.
Stormstout Brewery Challenge Mode is the devil. It took us around 4 days (about 6 hours or so a day of attempts) before we finally got it. Nothing made me want to flip my laptop like a table more than Stormstout. That gold time is HARD. But on one special attempt, an hour into our daily challenge mode session on a Monday night, the stars aligned and we got the gold in 11:53. I nearly lost my mind when the [Realm First! Challenge Conqueror: Gold] achievement popped up. I laid back on my bed and said "Wow...."
That's what Challenge modes are. If you're working on a raid boss, you'll have 5-10 minutes of concentration with relaxation in between. Challenge modes were 12-21 minutes of adrenaline-pumping concentration. There was no sitting back after a boss kill or stopping to drink after each pull; you were on a timer. And that timer fueled your adrenaline. Everytime we got a Gold time, my heartbeat slowed, the adrenaline instantly left, and I simply said "Wow...." as I laid back on my bed. Challenge Modes were the most intense content Blizzard has put in; and I was glad to accept it.
My best moment... was probably the first time i was setting my gnome locks foot into the black temple together with the raid group.
Its something I even today remember.
Oh dear gods, let me think...
Not long after WotLK came out, I took my shammy main and decided to grind out me some nether drake :} After hours upon hours upon hours upon hours.... upon hours of searching for these damn netherwing eggs, doing the quests, failing at the chase chain quest (made if nibally and got the chie though! ^_^) I MADE IT!
Got a royal ride straight back to Shattrah, haha.
And finally here it is: my favourite moment: when I got droppen by the drakes and was told to choose my future mount. The second my eyes met with her - I knew it just HAD to be her and no other netherdrake!
As I completed her quest, learned the spell and summoned her for the very first time, there, by the rest of the drakes and took into the Outland's sky with my beloved Zoya... yes, that's most definitely the most wonderful and most my most treasured moment in WoW. Ever
(for those who don't know - Zoya is the Veridian, or simply put, the green nether drake )
When the guild I was in finished Gruul's lair for the first time during BC. We had so much trouble with the guy, getting to 1% a couple times and were so frustrated, led to fights internally, almost broke up the guild in fact. When we finally killed him, everyone on vent went nuts. It was great.