Her basic pattern is to do two attacks in sequence then idle for a moment. Dodge the attacks then hit her for a bit and repeat.
To deal damage quickly, stand next to her and repeatedly use Up+X,Z (upward slash cancelled into block to make it recover instantly). If you're stood slightly out of range you can use Up+Forward+X to do it while moving forwards.
At long range, use Forward+X when she is idling immediately after an attack sequence, otherwise she might teleport out of the way and you'll be stuck in the long recovery animation. After Forward+X, cancel into Down+X so you don't end up in the corner, then Up+Forward+X to begin the slash spam.
If you can't get close at all then use Down+X+C (fireball) from a distance until you run out of meter.
When she starts an attack, wait to see what it is and react:
- Red aura = Fireball or Spinning Blade : Cancel into down+X to backstep and wait to see what it is. The same attack doesn't appear twice in a sequence, so if you see two red auras in a row then you know what the second one is straight away.
- Fireball : Hit it back at her with a jump attack or Down+X.
- Spinning Blade : Block it. Do stuff. Turn around and block it again. "Do stuff" will consist of either dodging the next attack or hitting the boss a few times. Do not turn around too early or the boss is more likely to teleport behind you and sandwich you between her and the blade, making you unable to block both.
- Teleport : She will do one of two attacks. Easiest thing to do is block.
- Teleport dash : The same as your Forward+X, or Forward+X+C on hard difficulty. Block the first hit and immediately chase her with your own Forward+X (this dodges the followup on hard difficulty). Then use Down+X to backstep out of the corner. If heading towards the corner is risky, just block the followup instead.
- Teleport slash : The same as your Jump+X. Always appears behind you. Just block it and wait near the middle of the screen to see where she reappears. You can also walk away from it to avoid it, which may be necessary if one of the random attacks is aiming at you.
- Ice : You get a couple of free hits, then cancel into down+X to avoid it.
- Fire wall : Use Down+X to step back slightly. Airdash through the fire wall and attack to drop down on top of the boss.
- Light beam : Jump. If you're attacking the boss you can squeeze in one more hit then cancel that into a jump. Use an air attack to delay yourself in the air slightly and subsequently drop to the floor faster. Try to hit the boss with it too if you can.
- Lightning : As soon as you see the floor marking, cancel into down+X to dodge it. On hard difficulty this is accompanied with a darksplosion that stays active for a moment. Stand well clear so you don't get knocked into it afterwards.
After hurting her a bit, random markers will start to appear. Try to hit the fireballs at the boss for more damage (easiest way is with a jump attack). The light beams can be blocked, but everything else must be dodged. The best option is to use Down+X to get out of the way. Stand especially clear of the dark markers as the explosion stays active for a while and you can get knocked into it.
On hard difficulty, when you knock her down to 50% life she will start following her two basic attacks with one huge spell.
- Fire : Starting on the right, hit as many fireballs as you can with jump attacks. Hit them towards the boss if you can. Finally head left and jump through the gap between the two fireballs and airdash through the fire wall behind them (alternatively, hit the fireballs on the right to the left to clear them out of the way). Attack to drop down to the floor then airdash through the other fire wall.
- Ice : Stand very slightly to the left or right of the middle column of ice and crouch.
Alternatively, spam Down+X+C at the boss until you are backed into the far corner. Stay facing away from the screen edge and use Down+X to dodge the ice just before it touches your feet. DO NOT try doing this in the corner behind the boss because her next attack will start during the backstep.
- Light : Hold block. When standing at the middle of the screen you need to face right, left, right (multiple hits), then left (multiple hits). If you're near the edge then there will be an extra beam in the bottom corner that you need to block.
- Dark : Walk a short distance at a time. Use Down+X+C if you can. If you end up in the corner you can get out with a well timed jump and airdash. The aim is to airdash just as the previous darksplosion starts to disappear so that you don't clip the far upper corner of it.
- Nothing : Yay.
Abuse the hell out of Down+X+C in this form, because getting close enough to attack normally is a lot harder.