1. Make a backup of the game.bin
2. Start Fable Explorer (get it
here).
3. Look for OBJECT in the scrollbar to your left.
4. Double-click OBJECT and scroll down until you find the weapon you want to change and double-click it.
5. In the new window click on the [+] in the left panel and click on 'CDefs'.
6. Find 'CWeaponDef' in the right panel, and click on the first link below it; '
Links to (GameBINENtryID):'.
7. In the new window click on the [+] in the left panel and click on 'CWeaponDef Particles' in the list.
8. In the panel on the right you'll see two '(int)Flourish Effect' with numbers next to it. Those numbers are the ID's of the effect in the 'effects.big'. (Double-click on the 'effects.big' in the top-left panel in Fable Explorer and on the [+] next to PARTICLE_MAIN_PC to explore the effects and their ID's.)
9. Change the numbers to change the effect (example: 773 is augment_fire_lightning_sword_01). I'd recommend changing both entry's to the same effect.
10. Click 'Apply Changes' in the 'CWeaponDef' window.
11. In the top bar in Fable Explorer, click 'Actions' and 'Save mods and run Fable'
12. Wait till Fable starts.