certain bosses do have higher pink drop rates. that's a fact. go to sewers never get one. go to plasma pyramids get a ton of cheap worthless ones. and also luck elixers although i've seen the write-ups that they don't make that big of a difference I don't agree despite seeing the math as I got 6 300k pink drops in less that a week using 4x combo elixer non-stop about 2 hours a day.