D&D 5E USING Variable spell-casting Ability Stats

[DND_Reborn]

Also in case it was missed the Artificer is an INT caster.

Altogether you have:
Bard, Sorcerer, Paladin, Warlock (3.5 CHA)
Artificer, Wizard, AT, EK (2.17 INT)
Cleric, Druid, Ranger (2.5 WIS)

So, INT is only a bit under-represented. If you move Sorcerer to CON, CHA-casters drop to 2.5--on par with the others.

 

[DEFCON 1]

When I ran my Eberron campaign, I made the spellcasting stat switch for Clerics, Wizards and Dragonmarked Sorcerers based upon their domain / school / dragonmark. So all three classes had possible characters that could use INT, WIS, or CHA as their casting stat. And quite honestly it worked completely fine. So there's no reason I can see that you couldn't do something similar for warlocks (or any class for that matter.)

Abjuration: WIS
Conjuration: CHA
Divination: INT
Enchantment: CHA
Evocation: INT
Illusion: INT
Necromancy: WIS
Transmutation: CHA

Arcana Domain: INT
Forge Domain: INT
Grave Domain: WIS
Knowledge Domain: INT
Life Domain: WIS
Light Domain: WIS
Nature Domain: WIS
Order Domain: INT
Protection Domain: CHA
Tempest Domain: CHA
Trickery Domain: CHA
War Domain: WIS

House Cannith (Mark of Making): INT
House Deneith (Mark of Sentinel): WIS
House Ghallanda (Mark of Hospitality): CHA
House Jorasco (Mark of Healing): WIS
House Kundarak (Mark of Warding): INT
House Lyrandar (Mark of Storms): CHA
House Medani (Mark of Detection): INT
House Orien (Mark of Passage): INT
House Phiarlan (Mark of Shadow): CHA
House Sivis (Mark of Scribing): CHA
House Tharashk (Mark of Finding): WIS
House Thuranni (Mark of Shadow) CHA
House Vadalis (Mark of Handling): WIS

 

[Tales and Chronicles]

In a short campaign a few years back I used the extra ability scores from the DMG: Sanity and Honor and made the warlock cast with Sanity and Paladin with Honor. Sorcerer was also moved to CON casting. I took a few WIS saving throw spells and made them SAN or HON saving throws instead.

T'was a fun exercise!

 

[bedir than]

Also in case it was missed the Artificer is an INT caster.

Altogether you have:
Bard, Sorcerer, Warlock (3 CHA)
Artificer, Wizard, AT, EK (2.17 INT)
Cleric, Druid, Paladin, Ranger (3 WIS)

So, INT is only a bit under-represented.

I tend to forget this too, but Paladins are a CHA caster

 

[DND_Reborn]

I tend to forget this too, but Paladins are a CHA caster

LOL, yeah it keeps messing me up because they still have CHA and WIS saves... so I default to WIS for casting.

Personally, they have no reason to get WIS saves in 5E IMO.