Secret gem of caster

NeroFest in September-ish. Other events may offer them as one time rewards but in small quantities.

Edit: Actually it seems none are in the lottos during NeroFest, only during the Christmas lotto.

The Secret Gem intake is going to be pretty dire for the next months. Events will reward a few but there are no big shops or lotteries.

Luckily for you though, farming Secret Casters gems is actually really easy. The rates from the daily are actually really good.

The only one I can think of for now are the Christmas events, both rerun and new. They are on a lottery basis so... Farm as much as you can!

Last year nerofest lottery had monuments, but this year it is supposed to have gems. Makes sense since we need 3x the gems vs monuments.

Lotto events will give you secret gems. Save your apples and prep your farmers. At 1 secret gem/box you need to open a LOT of boxes just to max one SSR.

That said, any node that drops hearts will also drop caster gems. I got about 15 of them in Valentine’s on the caster node.