The number of words in an incantation, the time required to chant it, the distance between oneself and the enemy, the enemy's movement speed, the enemy's reaction speed... As a mage, all sorts of factors had to be taken into account. For once acting as a mage, Zheng Zha's brain, which hadn't been used this way in two months, went into full gear.
Anyone with an intelligence of less than 200 really couldn't pull off being a mage.
And those who hadn't unlocked the Gene Lock basically needn't bother trying to learn spells; the efficiency was simply too low.
Chapter 50