ok having given this some of my time i think i understand this parse.
(100/5/70)
im not entirely sure on the 100 but knowing how sony ticks its max level for spell to work. so as my understanding goes, as long as all other spell criteria are met then [ (100/5/70) = (maxlvl/procrate (5%)/ minlvl) ]
to further confirm this, drink of vitae parses as such;
(100/33/0) and i know for sure that it works on any level plant ive killed and does indeed pop a shard a third of the time on average.
i hope this is acurate and helps others