Scourge Jelly is an unimportant, but valuable resource produced by developed hives.

Whilst acting as a resource that players wont immediately come across like Royal Jelly, Scourge Jelly is a resource produced by more developed hives that allows a Hive to begin producing a Harbinger and Scourge Caste Xenomorphs.

For Scourge Jelly to begin being produced, a Queen needs a lot of time to produce a single Scourge Jelly but can then create a Harbinger as long as a Praetorian is present.

Scourge Jelly is used in,

Scourge Jelly isn’t found within a usual Jelly Vat hive room. Rather, its found in a Jelly Vat hive room attached to the Raiding Chamber. In the jelly vats, Scourge Jelly fills them rather than Royal Jelly.