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You can make a Warlock that uses Int instead of Cha if you like, it won't break anything. It will feel different in terms of fluff and your story may play out differently, but in terms of mechanical crunch it's harmless.
When you create your Warlock character, you usually put you best ability score into your spell-casting ability and that determines your Spell Save DC and Spell Attack Modifier. It doesn't matter what that ability actually is, the outcome is the same. An Intlock with an Int of 15 has the same spell-casting punch as a Charlock with a Cha of 15. You could even make a Strelock with a Str of 15 and it would be the same. Because if the DM homebrews the class, you respond by switching the scores around when you build your character.
Where it does make a difference is in saving throws and skill checks.
The Intlock has better Int saves and the Charlock has better Cha saves, both because of proficiency bonus and because you have likely switched the ability scores around. But if the scenario is balanced and the DM is fair, there will likely as many occasions where you need one as the other so you will be equally successful overall, but maybe at different points in the story.
It makes a difference to which skills you would likely choose but, again, if things are balanced, it will even out. The Intlock who takes Investigation might be the guy who finds the phoney silver goblet while the Charlock who chooses Deception might be the one who gets a good price for it from the merchant. Things like that.
So it doesn't make any difference to how successful the character is in the long term, it makes a difference to the way the character is successful. It changes the story.
And that's great
When you create your Warlock character, you usually put you best ability score into your spell-casting ability and that determines your Spell Save DC and Spell Attack Modifier. It doesn't matter what that ability actually is, the outcome is the same. An Intlock with an Int of 15 has the same spell-casting punch as a Charlock with a Cha of 15. You could even make a Strelock with a Str of 15 and it would be the same. Because if the DM homebrews the class, you respond by switching the scores around when you build your character.
Where it does make a difference is in saving throws and skill checks.
The Intlock has better Int saves and the Charlock has better Cha saves, both because of proficiency bonus and because you have likely switched the ability scores around. But if the scenario is balanced and the DM is fair, there will likely as many occasions where you need one as the other so you will be equally successful overall, but maybe at different points in the story.
It makes a difference to which skills you would likely choose but, again, if things are balanced, it will even out. The Intlock who takes Investigation might be the guy who finds the phoney silver goblet while the Charlock who chooses Deception might be the one who gets a good price for it from the merchant. Things like that.
So it doesn't make any difference to how successful the character is in the long term, it makes a difference to the way the character is successful. It changes the story.
And that's great