Any of the Firestorm-type Pyromancies can be great and potentially end the fight if you pop one off right as they split.
That's... not exactly true in my case.
But let's start from the beginning: I did it. I beat this fucker after 3 hours of trying and 89 - 51 - 10 - 2 = 26 Effigies lost. That means I tried to beat this boss
TWENTY SIX TIMES... and in the end I succeeded (you get the Yellow Rags Armor Set as a reward).
For me personally this was
the hardest boss in the game and even harder than Flamelurker, Maneater and False King Allant in Demon's. About 90 minutes ago I died to him when he had only 1% of health left... a naked punch would kill him... you have no idea how that wrecked me (the later 10 attempts were disastrous - I would sometimes die even before the split). Then later on I miscast Soul Arrow instead of Heavy Soul Arrow (which would have killed him)... he punished me... That gives two times where I was this ---> <--- close to achieving victory.
I've been trying different strategies:
1) equip the Rebel's Shield to block and mitigate 90% of Dark attacks (the fucking orbs). <--- not a good idea when the orbs attack you from the side especially later in the fight
2) pure melee with Greater Magic Weapon <--- forget it. First boss in Dark Souls 2 that I did not even touch with melee.
3) Pyromancy after he hits 50% health. Well it didn't pan out exactly as I planned. My strongest Pyromancy spell: Chaos Storm took away maybe 22% of his health VERY RARELY. Most of the time it took between 15-20% so I had to cast it TWO times and the boss still would have some health left. Does Pyromancy scale with INT? I have Dark Pyro Flame +10.
They key to this fight (for me), besides incredible amount of luck, was to:
- unfocus and run around hugging the walls whenever Dark Orb is being cast (same exact strategy as in Scorpioness Najka boss fight when she casts the Arrows) and pray
- PRAY that when he gets close to 50% of health the last attack he does is the airborne laser one. THIS WAS CRUCIAL as it allowed me to Heavy Soul Arrow him a few times so when he drops and splits he had ~40% of health left. Of course you cannot trigger the airborne attack so it was PURE LUCK.
- bait him constanlty for melee attack (keep close range at all the times)
- throw the fuck away Havel's set and equip anything that has high Dark and Flame resistance i.e. Hexer's Set.
- equip the Blossom Shield for Stamina regen.
So he got airborne, landed and started to split. I cast Chaos Storm which takes away 20% of his life. Of course there is NO staggering and he attacks me when I stand up. I bail the fuck out by rolling to the side and run away. Usually I tried to bait the two of them to group together and melee me at the same time which would give me time to second cast the Chaos Storm. This time however (last time) I noticed one starts teleporting in the huge dark bubble and the other one melees me. I avoid the attack and Chaos Storm him. He has about 10% of health left. I calculate in my mind that is 2 Heavy Soul Arrows or 3 Souls Arrows. I run like a mad man getting hit for 30% of heath and instead of healing I cast HSA. He gets hit and I roll away IN THE VERY LAST SECOND to heal. Now the time almost stopped for me. I can see they are both grouped together on the FAR SIDE of the cavern doing I do not even know what. Coming at me I guess? Nothing was shining (Dark Orb) or glowing (Fire Orb) they just moved head on at me. In slow motion I cast HSA. I watch as it flies to the top of the screen and hits that fucker.
I stand still.
The Victory Message comes on screen.
I drink Estus.
It is done.
IT HAS BEEN DONE.