Learn Spanish (Latin America): Esquivar su ataque devastador es redifícil. - Dodging his devastating attack is extremely difficult.

The prefix re- acts as an intensifier, meaning "very" or "extremely." In many parts of Latin America (especially the Southern Cone, but also in Mexico and Colombia), attaching re- to an adjective is a very common, colloquial way to emphasize it in everyday speech. So redifícil is simply a more expressive way of saying muy difícil.

Why is the infinitive Esquivar used for "Dodging" instead of a gerund like Esquivando?

In Spanish, when a verb acts as the noun subject of a sentence (as "dodging" does here), you must use the infinitive. The Spanish gerund (ending in -ando or -iendo) is strictly used for actions currently in progress, such as él está esquivando (he is dodging). It cannot act as a noun.

Why does the sentence use es instead of está? Isn't dodging a specific, temporary event?

Even though dodging the attack happens in a specific moment, you are describing the inherent characteristic of that action. When evaluating or describing the nature of an action or idea (e.g., "doing X is difficult, easy, or important"), Spanish always uses ser, not estar.

The word devastador translates to "devastating". Does the suffix -dor usually translate to "-ing"?