How to change the damage formula for spells so that it depends on the hero's level.

The formulas are encoded in the game engine, and the xdb files have a clear structure; any violations of this structure can lead to the game crashing or individual elements malfunctioning (such as the bug with the instantaneous, devastating dive attack).

Some complex spells have additional parameters defined in DefaultStats; I remember that this applied to spells like summoning a Hive and creating Walls of Swords (possibly also Phoenix).