Inspired by what I did with my explosions that were based on RT FX works, I continued on this path. I tried to recreate a charge up and after a lot of testing I ended up with this result.
References:
1. https://www.deviantart.com/rt-fx/art/Sparks-097-Explosion-Impact-Radial-MIX-700427945
2. https://www.deviantart.com/rt-fx/art/Sparks-084-Charge-Radial-V01-688782286
The textures for the spark was based on images you can find on the web like this one:
https://www.vectorstock.com/royalty-free-vector/sparkle-symbols-and-vector-19101023
VFX | Energy Charge

I generated materials with the nodes. And once again, I used the technic of erosion for the ring based on this: https://realtimevfx.com/t/stylized-zelda-vfx/5234/3
And I learned how to do the end with my colleague. It was simply a stretched rhombus.