Not sure if this is being updated or not, but gonna post this here ^-^ After 448 battles I got 100 capsules from Hephaestus Peak. (Stage 4 seemed to drop capsules well for me)
[Animal] Hungry for Knowledge x11 Hungry for Knowledge x11 Cobweb Castle x33 Enigma Chest x19 Hell Portal x26
Sorry guys, I haven't forgotten the project. I'm having trouble sitting down to it with lack of a desk (or any furniture at all), but I'll tackle it soonish. Just a glance over the data hasn't shown any major shifts to percentages, but I intend to get it all recorded and updated.
27/100 drops were capsules (27% drop rate or about 1 in 4 chances for a capsule drop.)
i think the drop rates may have been improved.
Opened 27 Capsules: [Animal] Furgotten Friend x 5 (18.52%) Furgotten Friend x 2 (7.41%) A Picture for the Wall x 4 (14.81%) Bizzaro Gate x 8 (29.63%) Certificate of Adoption x 3 (11.11%) Midnight Circus x 5 (18.52%)
12 / 100 rewards were capsules. (drop rate 12% or about 1 in every 9 is a capsule drop. ) xp
Opened up 12 Gaia Lab open capsules: [Animal] Bionic Ears x 0 Bionic Ears x 2 Joker's Wild x 4 Little Green Vial x 3 Radio Havok x 3 What's the Manner x 0
It turns out you CAN get diamond charms from Kindred Wilds! I just managed to get one, on stage 4. I don't know if the rewards differ per stage but I thought I'd be more specific in case anyone was curious.
The RIG Fallen Star (part of the Milky Way caspule) also drops star/heart charms. I don't think it drops diamonds, but... it's good to know they are available in-game. That's something!