"Right, I should've started with that. Lighter abilities use your energy to summon something on the physical plane that doesn't necessarily... take up space. It's difficult to explain, but the reason why it's called "Lighter" is because the easiest Lighter abilities to imagine are ones that create light. Things like lightning, fire, or even light itself. It can also be liquids, but that's usually special liquids that are able to pass through pretty much anything."
"Evolver abilities constantly drain your energy to alter the structure of your own body. Doing things like granting wings, and on the higher levels, even slowing aging! However, since most of someone's direct physical power comes from using the universal uses of Psynesis, transforming yourself into something more powerful simply becomes less and less efficient as you're fighting enemies with more and more Psynesis energy, since you usually reach a certain cap on how strong you can make your muscles, unless you know a lot about biology."
"Summoner abilities conjure a solid substance on the physical realm. This is most commonly used for creating highly complex and personalized weaponry that would be extremely difficult to carry around, or even make in the first place. The most common use of it is to make combinations of things, like a gun and a sword, for instance."
"Enchanters enchant or otherwise alters a previously existing physical entity. Enchantments can be anything from increasing it's density to even adding things conditions that might do something upon hitting an opponent."
"Okay, that's a lot, but that's only four specialties."
"Well, you probably noticed, but all of these types of abilities affect the physical realm in some way, but each of these specialties have a mental counterpart."