Making Sword Slash VFX in Blender or for Game Engines like Unreal and Unity is NOT as difficult as it may seem.
Assets:
PIXL Shader Assets for VFX:
https://sprwtv.gumroad.com/l/PIXL
SwordMaster Real-Time VFX:
https://sprwtv.gumroad.com/l/SwordSlash
Videos shown:
Gabriel Aguiar Prod.
• Unity VFX Graph - Sword Slash Tutorial
Professor Goo
• How to add AUTOMATIC Sword Trails in Blender
VFX Textures:
https://artstn.co/m/pBbBy
Mocap:
https://www.mixamo.com
Music used:
Liquid Flame and Westward Tide by Masayoshi Soken
Final Fantasy XIV Online