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Starym

C'Thun's Eye Beam Is Different in Classic than in Vanilla

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Update: the issue has been fixed in today's hotfixes!

As the Chinese servers have opened the gates and cleared AQ40 already, players have noticed a discrepancy in C'Thun's eye beam behavior when entering the room, and it turns out the reason why it's different in Classic is quite the coincidence and an interesting story. As noted by many, when entering C'Thun's room, the giant green eye beam seemed to have a 10 second delay before firing, which makes entering the room, one of the more challenging tasks in the original fight, trivial. Clearly this is different than in Vanilla, and with Classic's #nochanges policy, it's very strange this would get purposefully altered. But it turns out, it wasn't.

As redditor lonelyman1968 explains, what actually happened was that Blizzard's reference client was coincidentally taken from a several week period when a temporary hotfix was applied to the beam to counteract another bug that occurred with patch 1.12 (the Classic reference patch, which was significantly after the AQ patch, as we'll recall), which made entering the room much harder than intended. This bug got a proper hotfix a few weeks later, but the reference client for Classic is in the middle of the "band-aid" hotfix period, which is why the range on the beam is smaller, meaning C'thun targets players much later, making the encounter significantly easier. Here's the full explanation, by lonelyman1968:

C'Thun Eye Beam Hotfixes (source)

Taken from this thread by user Blntd - https://eu.forums.blizzard.com/en/wow/t/cthun-beam-delay/170783/65

On August 26th 2006, a bug was discovered by Blizzard that made entering the C’thun’s room significantly harder than intended, as explained in this blue post from Tigole (Jeff Kaplan):

We’re in the process of investigating C’Thun’s behavior in Patch 1.12. Unfortunately, we won’t be able to fully fix the encounter without a new client build. We’re hoping to get a Patch 1.12.1 together in the next few weeks that will fix the problem.

In the meantime, we’re working on a Hotfix that will temporarily give players more time to enter his room without suffering extreme consequences. We hope to have this hotfix up soon.

Apologies.

(I can’t include links in my post but if you just google the quote you will find the blue post, it is archived on mmo-champion).

As explained in the same blue post, they instantly applied a fix that reduced the “range” of the beam when players entered the room. This is the version we have now in classic.

A couple of days after, on patch 1.12.1 (September 27th 2006), they implemented a “clean” fix of the original bug, and reverted the hotfix, making C’Thun work properly again (beam goes out as soon as someone peaks at the entrance). Again, it is explained in the blue post:

A hotfix has been applied to all realms which should make entering C’Thun’s room more feasible.

In 1.12.1 a cleaner, better fix will be applied. But for the meantime, the encounter should be doable.

TL;DR: It is consistent with the reference client…but the reference client is a snapshot of a hotfix that was patched in a matter of weeks, and is not a reflection of how the fight is supposed to happen in vanilla.

And if you're interested in knowing what the actual bug was that triggered all of this back in 1.12, here's chandrasekharr with the explnanation:

The Eye Beam Bug (source)

From theemus in another thread:

Long winded explanation of why it was changed to this in vanilla.

At some point during the naxx patch blizzard changed how zone wide aggro worked on bosses. The original zone wide aggro was added as a pulse to stop people from being able to out of combat rez during boss fights, I believe this was first added some time during BWL but I forget exactly.

The combat pulse put all players in combat, but it didn't assign any threat to them, so if for example a mage ran in to pull garr or instructor razuvious and ice blocked all the adds and boss would attack the immune mage until someone else in the raid did something to get on the threat table.

This was changes sometime in naxx, and each player in the raid was assigned a threat value (probably 1) upon the boss pulling, so the mage ice block pull didn't allow you to stroll in and pick up your mobs while they only attacked the mage, as soon as the mage blocked the mobs would start attacking other non immune players in the raid.

The way my guild (and most i'm assuming) pulled c'thun in vanilla was with a hunter using nature resist gear. He would run into the room and get the initial aggro while we would all run into the room being careful to avoid getting chained by the beams hitting him. Since none of us were doing anything to c'thun while we were running in, we weren't on the threat table yet and he only beamed the hunter.

Once they made the change to how global combat worked, c'thun would start beaming random targets off the start and getting into the room was extremely difficult. Blizzard made this change at that point to compensate for the issues their change to global combat worked.

Hopefully Blizzard will revert this change ASAP!

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