Biome keys in expert mode

[Wormi]

What is the drop rate for biome keys in expert mode ?
I checked the wiki and cannot get my answer

[Carrier Pidgeons]

1/2k normally, so I would assume either that or 1.5 /2x it, meaning 1/1k or 1/1.3333333k

[Unicarn]

Originally posted by Carrier Pidgeons:

1/2k normally, so I would assume either that or 1.5 /2x it, meaning 1/1k or 1/1.3333333k

Not necessarily. The chances for a Slime Staff are 40% higher than normal. It depends on the item.

[Pixel Peeper]

You must be wondering which difficulty is best for farming biome keys.

Must be pretty hard to test for unless the data can be mined directly from the game files.

The vast majority of the time, drop chances are doubled, so I would expect 1/1,250. Unfortunately I can't confirm that.

If it is, it would make Expert a better difficulty to farm for them. Mobs take longer to kill, but when farming for keys you're killing lots of trivial creatures, so improving the drop chance has much more impact than spending half a second more killing super weak mobs.

[Wormi]

So, is it possible to get the exact number?

[prpl_mage]

No, it is not.

The drop chance is higher. I found all the biome keys in my expert world. And I haven't spent an awful lot of time in it.

[Wormi]

Oh btw i finally found a crimson key on my expert world
I had to kill :
1900 dark mummies
1650 ichor stickers
1050 herplings
1050 floaty gross
600 crimslime

total = 6250 crimson monsters

I guess I was just not lucky