Any tips for Ancient Dragon, I'm pure melee here. I always run towards the tail when it takes to flight but sometimes I'll still get caught in the fire..1 hit kill.. ¬.¬
I tried that strategy for the longest time, and while I did get him on my dex with this method, I find it inconsistent and unreliable. He often turns at sharp angles when doing the AOE attack and running towards the tail can screw you over in those cases.
I prefer this method: bait the frontal breath attack, then run to the
front legs and hack away, but keep some stamina to return in front of its head, and if you have stamina to spare, whack its head. That'll bait his head butt attack which you can easily dodge (roll backwards). Then bait his frontal attack again. Though he
may leap off to do the AOE at that point, in which case just run away from its head.
If you have strong ranged attacks (such as Sunlight/Great Lightning Spear, Crystal Soul Spear, dual Avelyn, etc.), it's even easier, because you can always stay in front of him, lock on to his head, and hurl your projectiles. On my powerstancing Avelyn user (no, I don't use it in PvP except against douches XD) he almost never did the AOE attack and when he did I was already far from him so running back a bit was pretty safe.
However, no method is foolproof and you could still get clipped by the fire sometimes, so I suggest you try to survive the fire. Flash Sweat works wonders, you can survive the fire with only 22 VGR (+ 3rd Dragon Ring) with it. Great Magic Barrier isn't as good but does cut fire defense too, as do Small Orange Burrs.
You'll need to recast/eat a burr every now and then though, since it doesn't last that long and it's a long fight. If your VGR is high enough you can sometimes survive it without Flash Sweat or a Small Orange Burr, though you need significant fire defense (Flame Quartz+2 helps). I recommend Agdayne's set or the Saint robes because they're light and have high fire defense. The Penal Handcuffs also have strong fire defense.
I beat him many times now, but only once did I beat him without ever getting hit by the fire, so IMO those who say "go naked" give bad advice; surviving the fire is far less frustrating and give you a lot of breathing room.
Good luck!