what this effect or shader call? how to do it?

[sixtofive]

when enemy die, it show up like a boom

[ClockworkOcean]

It’s a post process. The Chameleon PP actor ( which was free for a while ) does something similar ( better example ):

Pulse - Chameleon Post Process for Unreal Engine 4

You can write your own version of this, but I can’t find a good example…