@Razvan Game changed in time. It started with saves like in 2nd edition ADaD (spell, wand, death etc.) and was changed to ADaD 3,5+ (WILL depending on INT, FORTIFY depending on CONSTITUTION and EVADE depending on DEXTERITY - this one also lets you evade melee and ranged physical attacks, not only spells).
Not sure what "psychic damage" is, but might be resisted by WILL save...future will tell. For now CHA only gives LUCK (overall nice stat to have) and lets you be better "petmaster" - you can have more summons and tamed pets + you can also tame stronger ones with more CHA.
Check summary topics like this, and if not sure about something, make new topic (but first search to make sure there is none similar yet ).