To be fair it has worked like this since Yuntal got reworked and I wasn't sure if this was intended. However, this patch Yuntal's tooltip was updated and it now shows crit instead of just AD and AS, so im guessing it's just a bug.
I don't want to be that adc main that just cries about their role being weak, but if this is actually a "feature" I would at least like an explanation as to why it works that way.
The rune also doesn't work with Terminus, but I can see why that would be a balancing issue.
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