After a brief conversation with Brandon on the matter, I think I might be onto something. This theory revolves our current understanding of Physics so it would be some time in the timeline before we could confirm these theories. However I cannot stop thinking about these ideas and Brandon confirmed a couple of my speculations. But if the skills that Shallan has displayed, along with the words of Pattern, we can extrapolate incredible future abilities.
Now I could be wrong simply because we don't have an understanding of all the radiant groups as of yet, but here me out about this. So what do we know are Shallans abilities? Well the first and probably the most powerful (that we KNOW of) is the soulcasting. Shallan can separate her cognitive mind from her physical body and interact with shadesmar directly. Once she masters this skill she will be able to use storm light as a bargaining chip to convert matter and form. I'm excited to see what this entails and if there are any real limitations to this power. Like can they only soul cast into one essence at a time? Why do the soulcasters in the Alethkar army look like they have stone for skin? So many questions, but despite this ability, I want to focus on lightweaving itself. i just feel that transformation is "more powerful" than progression.
No the ability to manipulate light is the real power here. Although "Lightweaver" is a deceptive name. Remember how Pattern said that Shallan could manipulate sound as well as light? When I read that the second time through I did a double take. I mean, on the surface these two are vastly different. Light is a collection of photons, where as sound is a vibration in moving particles. The only thing that these two truly share is that the nature of light and sound is determined by the waves and wavelengths that they maintain.
So how could this be? If Shallan is creating false light barriers, then that should be the extent of her abilities. it would still be amazing and incredibly versatile, but that's it. Including the ability to affect sound waves tells me that there is something far greater going on. If Lightweavers actually shape the wavelength of physical particles and energy waves, then her powers become nearly unlimited.
First I'll start with sound. If Shallan as a Lightweaver can control waves of vibration to create sounds, then what else could she do (Assuming stormlight were no object for the sake of speculation) Well she could most likely stun people with powerful sound waves. Especially in the water, large enough shock waves can actually stun of kill. Remember a noise is simply a managed vibration in particles including liquids and solids. If you can manipulate shock waves and add enough power, stunning people would not be too far fetched. Even Earthquakes are effectively massive shock waves that travel through the soil. They seem vastly different from a verbal shout, but on the large scale they really operate on the same physical premise. And we now know Shallan uses her powers to effect shock waves, so far just on the small scale. So we can presume that with enough stormlight, Shallan could cause an earthquake.
Now to the real power. Light manipulation. Often times we get comfortable in our spectrum of light. We have the colors of the rainbow and every shade in between. Shallan had displayed the countless applications of light manipulation in stealth and espionage. However we are not so limited in Physics. Visible Light is a tiny part of the Electromagnetic Spectrum. The levels of light along the spectrum are only different in their wavelength and frequency. This is where things get exciting. First lets go to the large end of the spectrum. So if we have two lightweavers, perhaps standing on the peaks of two different mountains. If the lightweaver can manipulate radio waves, using stormlight to create a variable radio broadcaster and receiver, we would have the perfect way to communicate without anyone being able to listen in. This could be very useful, although span-reads honestly are better at this, so this is less exciting. More likely Lightweavers would become radio hosts in the future as they transmit music and voices into the homes of radio owning families in the future. I can imagine Lightweavers as traveling radio performers sharing their skills as actors of comedians across the radio waves.
But it's the other end of the electromagnetic spectrum that gets really crazy. Imagine how soon x-rays for medical diagnoses could be used when your doctor can literally create x-rays out of thin air? Crime scene investigators will have a local Lightweaver create UV lights to help reconstruct the crime scene and look for trace evidence. But the ultimate form (That Brandon said would be too much to be practical both in needed stormlight and application) would be the control of Gamma Radiation. If this could be harnessed, Lightweavers could literally become mini nukes, or death guns. The biggest downside to making Gamma radiation would be the damage the lightweaver would most likely suffer. So gamma radiation is impractical but its a fun thought experiment.
So that's the end of my thoughts, I just see people talking about how Lightweavers are cool, but not as powerful as Windrunners. Now you know the possible future of lightweavers! The best part of this whole speculation was how excited Brandon was about my train of thought. I don't know if anyone had brought up this train of thought before. But he was happy to remind me that things will get pretty interesting when Lightweavers discover lasers and start using them in combat. Seriously, he said that, I couldn't ever make this up.
Hope you enjoyed!