In fact charisma increases mana points and determines how strong you appear to others.
I tested it and found out that when two chars have almost the same skills and stats
but different charisma one appears stronger than the other.
A boost from 70 to 120 in charisma changed the estimation.
So it`s like in real life, you can have a weak body but appear strong when you are charismatic.

I also tested ways to increase the power of magic, even with 220 in charisma the energy arrow neither
causes more damage, nor let you cast the spell faster nor uses up less mana.
The only thing that the percent bar changes is the amount of mana you need, the higher the more mana points.
When you are lucky and the spell was successful with 50% you wasted mana without any effect.
Tell me if you made different experiences, i would be grateful

Greetings,
Herleva, Steel Commander in Dark Empire