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Spawner Cores/$ are the beating heart of vanilla Spawners/$, which contain the essence of the mob to be spawned.

They can be forcibly extracted from a Spawner with a Spawner Extractor/$, but it's also possible to make these, and use them in the more powerful Pressurized Spawner/$.

There are two ways to obtain a Spawner Core:
• Forcibly extract one from a Spawner with a Spawner Extractor/$ (be ready for a fight!) Such cores are 100% filled with essence of that Spawner's mob.
• Craft your own Spawner Core and use a Vacuum Trap/$ to capture mob essence to fill it.

Note that it's possible for a Spawner Core filled by a Vacuum Trap/$ to contain the essence of several different mobs, which may or may not be desirable.

You can release a random mob from the core by right-clicking/$ it, but this can be a bit of a hit and miss affair. Producing a core with 100% purity via Vacuum Trap/$ isn't trivial, and takes some care.