Read the section, and you will find a lot of interesting information.
General rule for spells: acceleration, deceleration, and other curses last for a number of rounds equal to the hero's magic power (unless there are artifacts that increase the duration of the spells), lightning deals 25 * magic power damage, ice bolt deals 20 * magic power damage (without taking into account artifacts that increase or decrease damage), arrow deals 10 * magic power damage. More details can be found in the relevant sections.

Орден Феникса – харизматический :) лидер