Looking for a nice util.effect

I am working on a cloaking device and I would like a nice effect for when the player goes into cloak mode. I found some effects on the wiki but I am pretty sure there are more of them kicking around. If you know of an effect that would look good for cloaking, or know of a list of effects please let me know!!

propspawn is a fun one. But, you’d probably want to code the inverse of that for what you’re doing.

That would probably be the closest to what you want.