When fighting Valerian or the second Belnard (when you fight him at the mountain with the dead dragon), there is a certain Lightning spell that both of these bosses have that causes a read error on some versions of the game. A read error message will appear in the lower left corner of the screen, and any of the following side-effects might occur:
- Valerian or Belnard will take a really long time to cast the spell. The name of the spell appears, and then it's somewhere between 10-20 seconds before he actually casts it. Sometimes, they'll only take a long time when the read error first happens. And other times, they'll take a really long time each time they cast it.
- There will be no sound effect for the spell.
- The battle will lose all of its sound effects, not just the spell sound (but the music keeps going).
From what is known, in general the battle will run as normal, even though it may not have sound effects or it may take the boss a long time to cast the spell.
Taken with permission from Flying Omelette.