We've done a big shuffle of which Divination Cards can be found in each Map, which means most Maps drop fewer Divination Cards than before, but don't worry you can now see this information for yourself!
Vaal Skill Gems can now only be obtained from a set of specific methods such as Corrupting Gems, Vaal Side Areas, Divination Cards (that specifically grant Vaal Skill Gems) and the Lapidary Lens in the Temple of Atzoatl.
Now has a drop level of 68, meaning it can no longer be found naturally in act areas. [Verified on Divcord]