Special Process Effects is a section that can be found in ASM-Patches. On the first tab, there is a list of all Special Processes (called by ProcessSpecial(XX, argument, argument2);) and what Effect ID it uses. You can add your own Special Processes (keep in mind, that effect should be added first!).

On the second tab, you can see Effect IDs and where they're used. There, you can add your own effects and import an ASM script to it.