Considering that Zexion would have to have been still a child to early teenager when we he lost his heart, based on his appearance in Birth by Sleep, Nobodies should still age. Someone correct me if I'm wrong, though.
Along with what they said, try to kill the Yu Pagodas as close as you can to their max HP. When they revive, they come back with as much HP as they took damage before. For example, if you kill the left Yu Pagoda dealing a total 500,000 damage for that life and you kill the right one with a total of 68,000 damage for that life, then the left will revive with 500,000 HP and the right will revive with 68,000 HP.
It still shouldn't be that much of a problem, but be aware of this so you're not making it harder for yourself if the fight drags on for a while and you're wondering why the Pagodas are taking longer and longer to kill.
From my experience, the real major issue is that it's locked at 720p. AA and especially AF can be forced through the graphics driver. Framerate seems to be 60 on average if I set the power options to high performance, but occasionally drops to 30 for a second or two if there's too much going on (magic effects and stuff). This might vary from user to user.
You know what I would do with 13 million munny, going by your conversion rate? Nothing, because I don't have the room for it. Seriously, where does Sora and everyone put all that oddly shaped currency?
If you're going through battles and not getting map cards at the end of them, that means that you already have 99 in your inventory and can't hold any more. Use up as many as you can whenever possible to free up space.
...the planet Lordran and Drangleic are on is ancient Skaro?
Then some time after the end of Dark Souls II and before the Thousand Year War that sets up Genesis of the Daleks, the First Flame died and the Age of Dark began. The reason the war started in the first place is because the Kaleds and the Thals were fighting for control over the rediscovered Kiln of the First Flame and the First Flame's ashes.
And during the last decades of the war, the bombardment that crippled and disfigured Davros actually did kill him but it also activated the Darksign on his body. He still lives to this day because he is afflicted with the Undead Curse and manages to keep a secret bonfire lit. This also explains his Hollowed appearance and insanity.
Davros created the Daleks not only to survive and reign supreme over the universe, but also to collect souls and humanity, which is another reason why they actively go out to kill everything. This also goes to killing the Doctor: they recognize that he is a Fire Keeper (while he may or may not be aware of it) and want his soul.