Last boss in less than 10 minutes

[InfiniteEntendre]

I got platinum in this game 3 times on 3 different accounts (don't ask) the first time took me literally an hour with 2300 skeletons killed and it was hell... The last 2 times took me like 7 minutes. It looks to me like the boss's weakness is lightning. I went through the entire game picking up every special element arrow I can find and never used any. Any special arrows you pick up continue with you as you progress through the game. To finish the boss in less than 10 minutes first, only upgrade your reload speed until it's full, then upgrade your health until you can get top speed. By level 11 I was maxed. Then pick up all special arrows you can find (ESPECIALLY LIGHTNING) and that's it. Once you get to the boss make sure to hit him with all your lightning damage after that shoot him for a good 5-10 minutes and he'll die. Shoot him with any other special arrows too while you're at it.