I dont know how crit work. PLS HELP

at least 550ad with 100% crit hit chance, how im i dealing no dmg? less than 250ad vayne crit me like 500+dmg

{quoted}

Crits will have a chance depending on the amount of crit chance you buy to double your damage.

For some reason im assuming they are meaning the damage increasing. The cause of that is likely the fervor of battle. Also the double damage is flexible depending on what champion your playing, what runes you have, and if you have IE or not.