From the introduction:
Not every magic or hybrid item is the pride and joy of the artificer who crafted it.
Of course, some magic items aren’t made intentionally to begin with. These are the weapons bathed in the blood of star dragon’s last heartbeat, spell caches in the pocket of a technomancer as they perform the machine ritual to attempt to achieve digital godhood, powered armor that survives the explosion when a spaceship crashes out of hyperspace to slam into a medieval world’s greatest school of alchemy, or rings struck by a bolt of pure chaos when the witchwarper breaks the lich’s soulvault by shifting half of it to an alternate reality. Often these accidental magic items take well-recognized and familiar forms—flaming laser pistols and rings of resistance—but sometimes weirder items result from such accidental imbuements.