Being someone who farmed High Brunhilda to 2ub i think i have experienced the fight enougth to be able to give tips and point out error people topically make as this fight is much harder than High Midgardsormr.
Those tips are not how to get into the fight since you can just watch videos for POV of the character you're going to use, but more for how to improve in the fight.
First of all for those who are trying to get into the fight just because they have reached the 13k might, pls stop it, don't get into the fight without the required print or without having either the required hp to survive the initial blast she does which is unavoidable damage, and don't get into the fight without having the strength to be able to take her out or you will time out. The peoples who are doing that are just annoying public groups making them waste time.
Most people like doing dive cancel, which I personally don't like as you get a very little increase in dps in exchange of the fact that Thaniel generate less sp, in this scenario don't stay too close in front of her or you will get knocked down and lose dps, defeating the purpose of the dive cancel strategy.
During all volcano phases, place the volcanos close to her so that it's easier to hit her and the hide from hellfire, but don't place them on top of her as it will move her otherwise.
If you have the volcano dropping on you just move to the spot you want to place it and stop moving, the volcano will fall before the hellfire hits and you're safe as long as you stopped moving before the volcano hits, this applies in every volcano in every hellfire phase except for the 3rd volcano in the 2nd hellfire phase, that one will fall after hellfire hits so you have to hide in an existing rock.
During the first hellfire phase if it happens that Orsem gets the second Volcano, Xainfried should cover for the baiting role by baiting the breath in the opposite direction from the team since it's not easy for Orsem to place down the Volcano and get in place in time to bait that, also applied to the third hellfire phase.
She shots meteors 2 times, 1 after the breath that occurs after the first searing pillar and 1 after the charge that happen after the second chaser, in that phase normally Orsem takes that, but it's not rare that Lily by getting close to use s2 or Xainfried by using his s1 take that so make sure to check if a little purple circle appear on your feet, or just check who she faced before shooting the meteors in the skies.
The breath will get baited by Orsem most of the time who will try to bait it away from the team, but don't make it harder by spreading out in 3 different point of the map since the breath covers a pretty big angle, when you see where Orsem is baiting the breath make sure to move in a more safe place like behind Brunhilda instead of just mindlessy tapping the screen or just use a skill if you're not Thaniel.
Xainfried should alway try to have s2 ready for the time the team gets a break.
Carefull if you break her while she is doing the meteor anymation, those meteor will fall even if you break her so pya attention to bait those away from the team then shapeshift, otherwise those meteors will take out the dragons
So what can you say about players who weren't there when the Yuletree came out. Like myself I started during New Year's. I've done HMG but HBH seems like it's a hopeless case for me and I don't know if I'll ever be able to do it ever unless another Water Facility drops. Since I have Lily and not the other units sadly, how do I even get past the HP check. Poseidon could be viable but he's an RNG dragon.
If you don't have the Yuletree you can still get into the fight, but without a mub 5* dragon it will be very hard to be able to clear the fight, it's already hard enougth if 1 person is running a 3ub dragon.
Using Penglai on Lily will make it almost impossible to clear it
