This.
However, please notice that every time you GAIN or SPEND, the timer is RESET. So you can't go to 4 Seeds at 13:00, go into a 2 BP fight at 13:00, finish it, go into the next one at 13:10, come out 13:20 and be like "where's muh BP tick?"
It's at 13:30, because you spent BP at 13:10. It's a stupid system, but what can you do.Hah, nice, I was thinking ~2%-ish all this time.
Anyway, the Phantom weapon drop chest seems to be entirely detached from everything. You simply have a ~2% chance of getting one, period. Good luck.
As for Magnas, it's like:
Everyone: ~50% chance of Magna
Host: 1xx% chance of Magna (supposedly can give a double drop, chance unknown, can't confirm)
MvP: 1xx% chance of a Magna (supposedly can give a double drop, chance unknown, can't confirm)
Vice: ~10% chance of a Magna (the "you worked hard, too bad somebody else had a 100% Eidolon, now fuck off" award)Anything with Assault that you can pull off.
For non-whales, that's uh... Sword maybe, but that's not Assault. After Garuda, maybe Hammers. Good luck!