What is the role of the fantasy westward journey spell crit spell fluctuation machine? Which of the three is more lethal?

Increases damage when the explosion spell crits.

The damage of Faber spells fluctuates within a certain range, which may be high or low.

Low-level impact is not big, basically low, it is not recommended to fight.

The machine increases spell damage by 10%, that is, 100+0 10.

Answer over. There are good games, I hope to adopt them.