[quote=@Webmaster]
<Snipped quote by DarkwolfX37>

Using a combination of techniques. When encountering photons in the correct context, both antimatter and matter can be emitted from the decay of quantum particles emitted from electrons. Instead of using light as the energy source, antimatter can be generated from particle accelerators by moving particles and colliding them at an appropriate speed. Though this antimatter would be incredibly fast, Seth could slow them down by reducing the total heat in the particles. He can also isolate antimatter with his abilities to prevent it from annihilation from encountering matter. Through enthalpy, he can do either of these things because they are directly correlated to the energy in the system they are a part of. A third/most difficult option would be to freeze all the particles to absolute zero and reverse properties such as spin, momentum, etc. in order to reverse their quantum numbers. This would have the highest conversion rate, but would also be the most complex to pull off (though admittedly easiest to isolate). I am admittedly the least familiar with the feasibility of the physics of this solution, but based on my understanding, this would be successful with some particles.

In theory, Ma'at could do the same thing by using the third option but by the nature of her ability, it would be several orders of magnitude more difficult. She'd have to individually stop the motion, spin, etc. of each particle based on its current velocity and such properties and then recalculate that in order to convert it. She would also have to isolate it (which would be less difficult for her), but the conversion is the real issue in this scenario.
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The problem with that is that it would create a huge reduction in pressure and/or volume as more energy is altered. I also don't see how his power could let him isolate the antimatter unless antimatter is directly correlated with anti-energy. I also don't see how reaching absolute zero would reverse any of those things, and one could argue that absolute zero doesn't affect anti-energy and/or antimatter considering the only places we've observed it are outer space where it's always absolute zero. Even ignoring all of this, I don't see how Seth could actually control the antimatter after he made it, whereas Ma'at could easily just control any of it that he makes.