Since you did not notice for which protocol you are doing this and according to the interface from your screen, not for a new one, I sent you a file prepared for High Five.
You can't open this .u Try to check this package with UTPT software to take a list of effects, you need years and knowledge to know how it works and how maybe to edit it.
You can check effects lists and use them in soulshot.int like LineageEffect.FX_NAME
But if you need cool and new soulshot effects then write me in discord or Skype and I will show you how it works and some new styles so that you have a better idea of them.
I don't recommend to add some very huge effects because in mass PVP you might have problems with FPS or etc. It is important to understand how it works, what effects to develop so that they are not huge, but at the same time to be beautiful.
You need new shots effects, you can't do it without knowledge, I made a lot of custom soulshot effects. Therefore depending on what you need you can simply find the path to the default ones in the file soulshot.ini in system folder. Soulshots are divided by types ( magic, stick, etc ).
Let's say if you want to do it in a well and right way then you need to edit the retail files or create a new monster and manually adjust the sounds there.
Or you can just edit the sounds replacing them with empty ones (easy option).
This is not a perfect solution because in Lineage 2 many sounds are interchangeable. Many monsters use sounds from other monsters and it is possible that if he muffles one sound then another monster will also lose it.