The Chosen Ones

the other 2 start item base on % so its power wont decrease in later chap. but about the power hammer, although really imba at first, later it becomes quite useless. I dont know will it still be in my slot when it comes to chap 10
can you increase the number of maximum damage? you can make it so that player can't overuse it in early chap, like when it reach the number of 200 then killing monsters lv < 20 wont add more to the number. but the maximum number can reach 500