Spells for Eldritch Knight - Rules & Game Mechanics
An eldritch knight doesn’t have high enough spell slots for this to be properly abusable, but wizards can do devastating things with this at higher levels (RAW at least).
Can I use Spell Mastery, Expert Divination, and Mind Spike ...
Arcane Recovery: Eldritch Master At 20th level, you can draw on your inner reserve of mystical power while entreating your patron to regain expended spell slots.
Best Baldur’s Gate 3 Multiclass Bard Build - Deltia's Gaming
Spellcasters who Multiclass into a semi-spellcaster like a Ranger or a Paladin would get modified Spell Slots as they level up.