Easy way to farm Chiral Crystals in game, you can go back in South Knot City and rest couple times to reset the BT area.
Update!
I kill the Lion BT 2 times in a row just now, once i did it on Hard, and once on Very Easy. That is the data from both encounters!
HARD
14 shots from rocket launcher
1 minute from moment he appears to moment his health bar reaches 0
880 Chiral Crystals you get after killing him

VERY EASY
4 shots from rocket launcher
12 seconds from moment he appears to moment his health bar reaches 0
858 Chiral Crystals you get after killing him

There is no point of farming Chiral Crystals on any difficulty harder than very easy

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