To add onto that,
250 kill + cool = +100% damage/-1 weapon speed
500 kill + cool = 200/2
1000 = 300/3
2000 = 400/4
Not 100% sure though.
250 kill + cool = +100% damage/-1 weapon speed
500 kill + cool = 200/2
1000 = 300/3
2000 = 400/4
Not 100% sure though.

