long and thin, cylyndrical. It's basically just a long vial of "essence" of a particular element (fire/earth/water/air/others in my setting like dream, life, death, etc) in liquid form, which adds an effect to the blade based on it's element, With dream, you can actually make your blade phase through an enemy and put them harmlessly asleep; good for those who don't want to kill if they don't have to.
Oh, right, it does also need a power source to work. The core is slotted into a core-ready blade in the designated core housing, and an elecrtrical current from a small battery "activates" the core, producting the desired effect. The core will eventually run out with use, and need to be ejected and another fitted in.
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