Like season mode for regular severs. 
example are daily and weekly.

stars end 

Daily challenge 

kill 1k box of black stones or caphras.

weekly kill ten k get disto earring. 

this remove some rng and gives us flat rewards ten k mobs for single disto is great deal. Daily challenges can be changed weekly or monthly same with weekly challenges. Gives us rewards for grinding out mobs extra from the grind. This would make having quotas daily and weekly more beneficial. This works great on season for the  enhancement mats would love to see something like this for regular severs for other items.