I have 10 retainers and all of them are max level with level 100 gear for two characters, so that's 20 retainers doing the 18 hour ventures daily. They are split having 5 DoW/M and 5 DoL for both my catgirl mains. Since DT came out and maxing them last summer, I have not seen a single stone partition or neon lights drop in any ventures since then! The drop rate is atrocious and it makes me not want to send them out anymore. Please increase the drop rate, they are expensive on the MB and usually are snatched up quickly because of how rare they are. It's extremely frustrating that the drop rate is atrocious and maybe they should increase it for the more retainers you have as an incentive for subbing them.