Made with a white pentagram on a black background, applying a hefty Gaussian blur and then using BoltBait's Fire Effect v 4.0 plug-in in Paint.net
This is a completely free image Burning pentagram that you can download, post, and use for any purpose.
Image License: CC0 No Rights Reserved
You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission, and at no cost. This image is completely free.