What does defense rate actually do and how do you calculate defense?
Don't know, but all I do know is that defense is a worthless stat. As nearly all endgame bosses and future one's too do true damage making it a worthless stat. HP is a better stat
defense rate is useless. all bosses have 100% pen for the most part so its a useless stat.
for pna use reduction and hp instead , on passives its just useless and the raw defense some chips have on trinkets only have use for pvp.