Luminite Hammers are four tools. The four types are the Solar Flare Hammer, Vortex Hammer, Nebula Hammer, and the Stardust Hammer, each themed after a different Celestial Tower. They are all unable to be crafted, and instead the player must craft the Luminite Hamaxes.
If obtainable, these would have the second highest listed damage of any tool, beaten only by the Butcher's Chainsaw.
With current methods, it is impossible to hack these items into a character's inventory using external editors, as they will disappear from that character's inventory as soon as they load into a world.