Add magic with "soul resources" and electricity as a "scientific" approach.

Bundles can be upgraded to "bag of souls" (via enchantment or perhaps crafting), where they will store the souls collected by the player. It can happen when the player kills an undead mob or mines a skulk block (instead of dropping XP). Artifacts can be added to use this "bag of souls" to regenerate player health, damage mobs or blocks, heal pets or anything nicer.
Electricity, on the other hand, will use lighting rods as a source and a "Leyden jar" (it could also be called as "Condenser Jar") to store the energy. The "Condenser Jar" could be made of clay (like those in the archeology stuff). These other artifacts will be "electricity-based" to stun mobs, deal damage or cast fire.

Obviously, artifacts should be considered as "Treasure Items", so they cannot be crafted. But there are many places to put them, like the deepest caves or the highest mountains.