This is taken from Nexon's forums, for anyone who doesn't bother reading them.
Posted by IohannaFiona:
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Break Videohttps://www.youtube.com/watch?v=AycxlKG0KgAVideo DescriptionOk I know there are several Thor break off videos out there. But what I am to do is to *really* guide you (my esteemed watcher) through the break-off process. Hopefully once this gets around, every pick-up group out there will be breaking
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===GENERAL IDEA=== Freeze, chain-chain, break.
===FREEZE=== During cutscene, nobody move. Once the battle starts, Evie moves forward and casts ice-spear on Thor.
Note: We once experienced a period where Thor refused to freeze up. Then Karm lowered his int stat, and Thor started freezing again. Don't know how that works, but just an FYI.
===CHAIN-CHAIN=== Immediately after freeze, chainers need to chain. Aim for the tip of the mouth. Don't worry about aiming, it'll stick as long as it's somewhere around the upper 1/3rd of the mouth. You're more likely to miss because you took too long to aim (and let the Thor swing his head), as opposed to actually missing the chain-point.
When you've stuck on, YOU MUST PULL BACK. Now, this is what I wish the other break-off videos told you; all you have to do is tap your 'back' button (should be 's' on keyboard-mouse setup) periodically, and that counts as 'pulling back'. All too often, people will hold down 's' and end up too far away to re-chain. Tapping will allow you to release your chain closer to his mouth.
Your job as a chainer is to pay attention to your position, and your chain. Adjust yourself in a nice position to re-chain. Watch your chain so you know when to pick up your chain and start chaining again.
===BREAK=== If you hit the mouth, THE CHAINS WILL RELEASE. Evie's fireball and mana mine AOEs do not count as a 'hit' (as long as the first hit was on the tongue, you'll be fine), so avoiding the mouth is easier than you think.
The tongue will flail around. Lann and Fiona's charged attacks are nice cause you can time your release. The Epic Torches lying around HELP A LOT, but it might take some effort to smash something that's flailing around.
Sometimes an Evie goes behind Thor and casts ice spear. Usually this stops the flailing, but it *could* freeze the tongue in an uncomfortable position. Hopefully you've got a pro-evie who knows how to time it.
Happy breaking! Special thanks to my guildies at Samsara who regularly break with me XD
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I'd really like for us to get a group to try this out together. This is one of the few things in this game that requires some group-wide coordination above the level of palala-spamming. In addition, prospective guild recruits sometimes see Thor break offs as a standard mark of group cohesion.
Besides that, I still need the BP for break off cause I've never done it