mellored
Legend
Balance wise, there's not much difference between Int and Cha. So why not?
However, Wis is an important saving throw. So a Wis warlock will have about +4 against charm spells. Not game breaking, but slightly unbalanced.
In my game I've house ruled letting players pick Int, Chr, or Wisdom, as their casting stat no mater what class they've picked. I did not want to have a warlock or sorc being the charisma character of the party unless that's what they wanted. I even have a bard that wanted to be intelligence based so they could master history and arcana rather than performance and diplomacy.
However, Wis is an important saving throw. So a Wis warlock will have about +4 against charm spells. Not game breaking, but slightly unbalanced.