Managed to beat all chapters on intensity 9 after a lot of perseverance - few tips for those who want to try and do them.
For every level, Pisces Heal Level 4 is incredibly useful, you can go from no health to around 3/4 health which is just ridiculous. This saved me in Chaos Vortex, Three Trials, and Hades Heart chapters. Also, getting a very good idea of where the enemies are in both the air battles and land battles will help you a lot.
The hard chapter tips:
Chapter 7 - The boss battle in this is incredibly easy (just be careful of its sword and foot stages) but getting to Thanatos is a pain. Main thing is to get a really good idea of the air battle as it is really annoying. Once you get past the air battle just take it slowly, better to dodge attacks and attack the enemies when you can than go charging in. The main annoying rooms are when you're on the moving platform and the room before Thanatos. Invincibility and transparency help a lot on the moving platform bit as you don't have much room on the platform to dodge and don't want to fall off. As for the battles before Thanatos, use the pillars to your advantage to hide from enemies and be incredibly careful with the Mega Mussel.
Chapter 13 - Air battle is pretty easy once you get the hang of it and really until the Dark Pit battle things aren't too hard, just be careful in the battles before the mirror rooms. As for the Dark Pit battle, don't waste your time attacking the Lunar Sanctum Control Center until after you beat Dark Pit. Best way to easily beat him is to just use charged shots, dodge his attack then shoot. Using invincibility/transparency to get the odd melee attack on him can help if you're having trouble, but since you get a god drink after beating him it's better not to waste items. Not too hard until the battle before Arlon - this is where Pisces Heal really helps, as well as invincibility. Arlon himself isn't too hard if you're careful, just watch out for his laser attack as that will shave off insane amounts of health, and just concentrate on dodging and only attack when there is an opening.
Chapter 18 - PK (Straw Hat Luffy) covered most of this in his post. I found it easier to go for the centurion strong arms before the archers though as the archers damage may add up but it's nothing compared to if the strong arms manage to grab you. Be careful in the part where there's a strong arm, a guard, and an archer - I usually just run past them but sometimes you get unlucky and they manage to triple team you. In the battle before Pit's Body ONLY go behind the juggernaut if the strong arms are near it as otherwise they will start throwing weights at you and you won't be able to dodge them then just spam attack them. PK covered the Pit's Body battle but as for the air battle afterwards, use your blue bubbles when you get surrounded by three guards, this happens a few times and better be safe than get triple teamed by them.
Chapter 19 - Use a fast weapon so you can just run past the enemies on the stairs otherwise that damage can really add up (not much space to dodge their attacks). Pisces Heal is seriously helpful here and until the battles where you have to hit the targets on the pillar, things aren't too hard - just take that slowly. DON'T underestimate the chariot master, he may be easy on lower intensities, but he is really annoying on 9, I went into crisis mode a few times, so if you still have pisces heal here, that'll help. Effect recovery helps a lot in this fight as the fire bombs he drops are what really start to add up damage with that + the burn.
Chapter 21 - Max Pisces Heal + Max Aries Armor is all I brought as this is just about surviving as long as possible. The air battle is insanely hard - concentrate on taking out Chaos Kin's fire missiles as those do insane damage because of the burn. Just be happy to survive the air battle and then the first two waves are the annoying ones, especially the second, but once you get past them, everything's pretty easy until wave 12, though be careful on the shootfly wave. Use aries armor on stages 2 and 13. The actual chaos kin battle isn't very hard, just be careful of his charge attack. One thing to watch out for though in this level is Dark Pit accidentally attacking you so it's best to stay clear of him - he also attacks you if you attack him "accidentally" so don't do it...
Chapter 23 - Hardest chapter in the game imo. The air battle itself is pretty easy, the main thing is when you find Hades, use your blue bubbles on the enemies. The land battle however is incredibly annoying, it's tough enough to get to Hades Heart and then that battle -_-. First bit that can catch you is the Cellular Monoeyes after the first room, I used invincibility for the first three, and then when you get to the green platforms you shoot, take out the monoeyes before moving forward as they're easy to take out then but annoying when you go up the platforms if you don't shoot them. The next annoying part if you're not careful is the cellular sinistew - just spam melee attack it quickly as it does stupid amount of damage if it grabs you. From there things aren't too bad until the wave of battles before Hades Heart. Though it's hard not to use Pisces Heal here, not using it will really help when it comes to the Hades Heart battle. The main annoying one in these waves is the Erinus, I used invincibility a few times to help against it, just be really careful of its top half spin attack once you've split it into two. The Hades Heart battle is incredibly hard, I know Acklow talked about using a Bow so if you can do the level with a bow then that'll help, but I used Claws as couldn't get to Hades Heart with a bow. Just stay away from the green aura'd one as that's a fake and you'll want to take as little damage as possible because once the real heart goes into red rage aura, things start to get tough - you have to get it into this stage 5 times before you take it out a few attacks after that. It's as fast as +4 speed lightweight power claws so it's not easy to run from, try and dodge out the way when it comes - if you've got Pisces Heal then things will be much easier, just try and take less than half health from each angry phase as you'll recover about 3/4 when you use it (I used it on the 3rd rage phase).
Chapter 24 - Tough chapter because of the amount of battles and a few annoying bosses reappearing. Up until the battles before Kraken, things aren't too hard, just take Phoenix slowly (concentrate on dodging when it uses fire attacks) and be careful of the Mimicuties. Also fast weapons help for quickly running up to the battle before bosses. In the battles before Kraken, your main threat is the spinning Claxis so concentrate on that and just be careful of the Space Pirate that will come charging after you. For Kraken, mega laser helps loads, as well as going up close to it, using invincibility as it goes to bite you then spam melee attacking it. The main attack to be careful of is when it shoots balls at you as if you get hit by one, you're almost certainly going to get hit by the others. Just take Magnus vs Gaol slowly, Gaol is pretty easy, but Magnus is the one to watch out for, just don't let him get close as he'll melee attack you for a load. Fake Palutena just requires moving around while shooting. The Great Sacred Treasure is ridiculously hard - try and keep Pisces Heal for it as it'll help a lot, just concentrate on dodging and wait for openings to attack it, the main attacks to watch out for are the fire ball shooting and when it charges at you.
Chapter 25 - this isn't that hard, but just putting it in as if you don't only attack Hades with charged shots, it can be incredibly hard - charged shots do WAY more than normal shots so the wait for them to charge won't matter.
Mainly for PK as he wanted a pic of the completed Hades Treasure Hunt - yes I used feathers for some but try beating boss battles on hard -_-
The hard chapter tips:
Chapter 7 - The boss battle in this is incredibly easy (just be careful of its sword and foot stages) but getting to Thanatos is a pain. Main thing is to get a really good idea of the air battle as it is really annoying. Once you get past the air battle just take it slowly, better to dodge attacks and attack the enemies when you can than go charging in. The main annoying rooms are when you're on the moving platform and the room before Thanatos. Invincibility and transparency help a lot on the moving platform bit as you don't have much room on the platform to dodge and don't want to fall off. As for the battles before Thanatos, use the pillars to your advantage to hide from enemies and be incredibly careful with the Mega Mussel.
Chapter 13 - Air battle is pretty easy once you get the hang of it and really until the Dark Pit battle things aren't too hard, just be careful in the battles before the mirror rooms. As for the Dark Pit battle, don't waste your time attacking the Lunar Sanctum Control Center until after you beat Dark Pit. Best way to easily beat him is to just use charged shots, dodge his attack then shoot. Using invincibility/transparency to get the odd melee attack on him can help if you're having trouble, but since you get a god drink after beating him it's better not to waste items. Not too hard until the battle before Arlon - this is where Pisces Heal really helps, as well as invincibility. Arlon himself isn't too hard if you're careful, just watch out for his laser attack as that will shave off insane amounts of health, and just concentrate on dodging and only attack when there is an opening.
Chapter 18 - PK (Straw Hat Luffy) covered most of this in his post. I found it easier to go for the centurion strong arms before the archers though as the archers damage may add up but it's nothing compared to if the strong arms manage to grab you. Be careful in the part where there's a strong arm, a guard, and an archer - I usually just run past them but sometimes you get unlucky and they manage to triple team you. In the battle before Pit's Body ONLY go behind the juggernaut if the strong arms are near it as otherwise they will start throwing weights at you and you won't be able to dodge them then just spam attack them. PK covered the Pit's Body battle but as for the air battle afterwards, use your blue bubbles when you get surrounded by three guards, this happens a few times and better be safe than get triple teamed by them.
Chapter 19 - Use a fast weapon so you can just run past the enemies on the stairs otherwise that damage can really add up (not much space to dodge their attacks). Pisces Heal is seriously helpful here and until the battles where you have to hit the targets on the pillar, things aren't too hard - just take that slowly. DON'T underestimate the chariot master, he may be easy on lower intensities, but he is really annoying on 9, I went into crisis mode a few times, so if you still have pisces heal here, that'll help. Effect recovery helps a lot in this fight as the fire bombs he drops are what really start to add up damage with that + the burn.
Chapter 21 - Max Pisces Heal + Max Aries Armor is all I brought as this is just about surviving as long as possible. The air battle is insanely hard - concentrate on taking out Chaos Kin's fire missiles as those do insane damage because of the burn. Just be happy to survive the air battle and then the first two waves are the annoying ones, especially the second, but once you get past them, everything's pretty easy until wave 12, though be careful on the shootfly wave. Use aries armor on stages 2 and 13. The actual chaos kin battle isn't very hard, just be careful of his charge attack. One thing to watch out for though in this level is Dark Pit accidentally attacking you so it's best to stay clear of him - he also attacks you if you attack him "accidentally" so don't do it...
Chapter 23 - Hardest chapter in the game imo. The air battle itself is pretty easy, the main thing is when you find Hades, use your blue bubbles on the enemies. The land battle however is incredibly annoying, it's tough enough to get to Hades Heart and then that battle -_-. First bit that can catch you is the Cellular Monoeyes after the first room, I used invincibility for the first three, and then when you get to the green platforms you shoot, take out the monoeyes before moving forward as they're easy to take out then but annoying when you go up the platforms if you don't shoot them. The next annoying part if you're not careful is the cellular sinistew - just spam melee attack it quickly as it does stupid amount of damage if it grabs you. From there things aren't too bad until the wave of battles before Hades Heart. Though it's hard not to use Pisces Heal here, not using it will really help when it comes to the Hades Heart battle. The main annoying one in these waves is the Erinus, I used invincibility a few times to help against it, just be really careful of its top half spin attack once you've split it into two. The Hades Heart battle is incredibly hard, I know Acklow talked about using a Bow so if you can do the level with a bow then that'll help, but I used Claws as couldn't get to Hades Heart with a bow. Just stay away from the green aura'd one as that's a fake and you'll want to take as little damage as possible because once the real heart goes into red rage aura, things start to get tough - you have to get it into this stage 5 times before you take it out a few attacks after that. It's as fast as +4 speed lightweight power claws so it's not easy to run from, try and dodge out the way when it comes - if you've got Pisces Heal then things will be much easier, just try and take less than half health from each angry phase as you'll recover about 3/4 when you use it (I used it on the 3rd rage phase).
Chapter 24 - Tough chapter because of the amount of battles and a few annoying bosses reappearing. Up until the battles before Kraken, things aren't too hard, just take Phoenix slowly (concentrate on dodging when it uses fire attacks) and be careful of the Mimicuties. Also fast weapons help for quickly running up to the battle before bosses. In the battles before Kraken, your main threat is the spinning Claxis so concentrate on that and just be careful of the Space Pirate that will come charging after you. For Kraken, mega laser helps loads, as well as going up close to it, using invincibility as it goes to bite you then spam melee attacking it. The main attack to be careful of is when it shoots balls at you as if you get hit by one, you're almost certainly going to get hit by the others. Just take Magnus vs Gaol slowly, Gaol is pretty easy, but Magnus is the one to watch out for, just don't let him get close as he'll melee attack you for a load. Fake Palutena just requires moving around while shooting. The Great Sacred Treasure is ridiculously hard - try and keep Pisces Heal for it as it'll help a lot, just concentrate on dodging and wait for openings to attack it, the main attacks to watch out for are the fire ball shooting and when it charges at you.
Chapter 25 - this isn't that hard, but just putting it in as if you don't only attack Hades with charged shots, it can be incredibly hard - charged shots do WAY more than normal shots so the wait for them to charge won't matter.
Mainly for PK as he wanted a pic of the completed Hades Treasure Hunt - yes I used feathers for some but try beating boss battles on hard -_-
