Here's a question: How do you calculate the fire wall damage for each 1 point of cold resistance? So that you don't make a mistake when calculating whether it pierces the enemy's defense.
Basic - creates a wall that is two squares wide. Enemy units passing through it receive damage=SP*10+10
Advanced - Wall is 3 squares wide, damage=SP*10+20
Expert - damage=SP*10+50
To sell my soul