Orange glass marble research

[Otonashi]

To the above statement:
It seems like a 5 man party increases your drop rate for common items, but decreases your the drop rate for rare items like some of the stones and the lotus spoon. I found more of the rare items solo vs being in a full party.

This shouldn't be the case, as drop rate of enemy-specific items seems linked to the level of the enemy. Stones should have the same drop rate regardless of whether in a party or not, while Magatama (and Marbles) should have an equal drop rate from all enemies that drop them. Magatama only drop from enemies that are an equal level to the Magatama or higher, but there is an upper bound to the allowed level as well. Being in a party increases the level of enemies in dungeons, hence why being in a party when hunting glass marbles isn't suggested. While there is a chance that being in a party still allows glass marbles to drop, you may also be wasting your time as no one has shown that a large party size allows marble drops.

[Youshin]

For plover is it only exclusive to hell mode? and does it still drop solo?

[Chieko-sama]

I accidentally put my set 1 skill card to a sword and now have no steal attacks haha

well it's not that hard to get them just need patience I think

[XJ22]

Plover Pit NORMAL

My first time there and i got the marble at first run xD Yes, it was on NORMAL difficulty. The chests also dropped ash and vermillion marble.

[KirieSakura]

PLOVER - SOLO - HARD

my first run this night..