If an Eldritch Knight focuses on spells that don't have an attack roll or saving throw, INT (spellcasting stat) becomes less critical. But is there still a minimum INT required to cast spells of a certain level? How low of an INT can an Eldritch Knight get away with?
[RPG] the minimum INT practical for an Eldridtch Knight
character-creationdnd-5e
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Best Answer
No. Your spellcasting ability is only used to determine spell save DC and spell attack roll bonus.
There's no minimum, rules-as-written. Even spells like feeblemind now explicitly state that spellcasting is blocked rather than relying on low ability scores to prevent casting.
Rules-as-written, you can cast spells with an Int of 8 if you're using the default array. Your ineptitude at doing so is only reflected in the attack modifier of -1 + proficiency bonus and extremely low spell save DC of 7 + your proficiency bonus.
If you're rolling ability scores, you could conceivably have an Int of 3. A Wizard could with an Int of 3 could still cast 9th level spells. They just wouldn't be very potent as far as attack rolls (+2 modifier) or save DCs (DC 10).