If Vasher is in fact the one who made Gavilar's anti-Light then this man has invented 2 completely unrelated weapons of mass destruction.
Anti-Light is very clearly the investiture equivalent of antimatter. Like antimatter, which has the same "mass" as regular just opposite charge, anti-Light has the same energy (wavelength) as Light, but opposite amplitude. When combined, they're completely eradicated as they're transformed into energy (explosion). This applies to antimatter and—as seen in Rhythm of War—anti-Light. Not only can this create a bomb, but it can perhaps create the bomb.
The issue with most conventional weapons (and any source of fuel, really) is that their conversion into energy is imperfect. There's numbers floating around out there about the percentage of energy actually put out per source from wood to gasoline to plutonium. The big thing about all of them is that they create some byproduct besides the energy. Methane combustion for instance always puts out carbon dioxide and water.
In Einstein's famous equation, E = mc^2, we are given a "perfect conversion" between mass and energy. You can X kilos of matter from Y Joules of energy and vice versa, assuming you don't lose anything to byproducts. This is a shit load of energy. That c in the equation isn't a variable like E and m are. It's the speed of light. 299,792,458 meters per second.
By and large, tapping into this energy is really super hard. As I mentioned, there's always byproducts. Even ignoring the issue of entropy and diffusion of energy into an environment, most of it is preserved by the aforementioned material byproducts that come out of chemical reactions. The most efficient reactions we have in the modern day is all nuclear in nature, be it fission like decaying atoms in nuclear reactors or fusion like within the sun. But even then, for all the energy they release, you will still come up with matter in the end.
That is unless you have antimatter.
The amount of energy you will release from a kilograms worth of an antimatter bomb is 1000 times stronger than that released from Fat Man dropped on Nagasaki. Half of that of the largest nuclear bomb ever tested, the Tsar Bomba. 90 petaJoules of energy.
If Harmonium/Trellium was the Invested equivalent of a nuke (hi, this is a Cosmere post, remember?) then antiLight is far and away worse, and it's been invented on two separate occasions, once by Navani (#girlboss), and—if theories turn out to be correct—Vasher, who's given us other hits like the God Killing Sword.
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