Can you use Effect Veiler or Fiendish Chain to negate your Number 42 Starship Galaxy effect that protects opponent from damage in Yu-Gi-Oh?

You cannot use Effect Veiler or Fiendish Chain to negate Number 42: Galaxy Tomahawk's effect that prevents your opponent from taking damage. Here's why:

* Number 42: Galaxy Tomahawk's effect is a continuous effect. This means it's always active as long as the monster remains on the field.

* Effect Veiler and Fiendish Chain can only negate activation of monster effects, not continuous effects.

In other words, you can't negate the effect of Galaxy Tomahawk because it's not being "activated." It's simply active all the time.

Here's a breakdown of how it works:

1. Galaxy Tomahawk is summoned to the field.

2. Its continuous effect activates automatically, preventing your opponent from taking battle damage.

3. Effect Veiler or Fiendish Chain cannot negate this effect because it's not being activated.

Therefore, you cannot use these cards to stop your opponent from being protected from damage by Galaxy Tomahawk.