What we have learned...

[Remedi]

not really defending the sysetm but, with a party of 4-5 got about 25+ in about 1 hour, the rate seems to be higher with a party (note the enemies were lv 5) also you get a sure crystals once you get 30 chain (also the guy in the camp is saying that chain increases quantity of drop, I suspect the lv 23 monsters will do that).
Take from this whatever you will

@alleo (limit posts) I've been receiving one at 30 constanstly from mobs lv 3+ maybe it's like 80% but definitively very high same goes with the friend I was in

[Alleo]

not really defending the sysetm but, with a party of 4-5 got about 25+ in about 1 hour, the rate seems to be higher with a party (note the enemies were lv 5) also you get a sure crystals once you get 30 chain (also the guy in the camp is saying that chain increases quantity of drop, I suspect the lv 23 monsters will do that).
Take from this whatever you will

There was someone on reddit that said that they get got no crystal when they had a 30 chain, so I am not sure if this is a 100% drop or if this is only a really high RNG increase. I also was in a party and we did have some 30 chain (cant remember if I always get a drop or not) but I would have not gotten that amount of drops in an hour since I had like only 6-7 after that.