>>531168385
At lvl 5 it gives 718 cost regen per second.
>718 base
>*1.266 with a student with 26.6% cost regen sub
>*15 or 16.9 seconds depending on having that buff retention upgrade from UE40
>it's 15361.9 cost regained
>1 cost cell costs 10000
It effectively halves the cost of her skill in the long run.

>>530172868
It goes like this
>X days / 1 day left - more than 24 hours
>23 hours and less left - well...

>>529975281
Idk. John Nexon's mind is an enigma. Sometimes we get gear like Toki's bond gear or Saori's and sometimes we get hot garbage like Kotori's bond gear.