As per the title, we understand that yesterday drop rate was mistake, however for current drop rate of summon stone are too low, even lower than previous few city event like calamity. Hopefully you guys can slightly increase its drop rate since this city is only have 5/20stam cost. For hard(20) normally player only able to do 5-7 steps per pots spend. Now we only get 1 or 2 stones per 10 pots spend its totally unworth. Please do something! Thanks.