New World Best Early Game Weapons & Jewelry Farming 2024
This weapon provides three incredible special bonuses, including the ability to alleviate a spell slot burden when casting a spell.
Guide:Multiclassing Guide by Phantomsplit - bg3.wiki
See the multiclassing rules to determine your available spell slots.
Spells in dnd 5e – Comprehensive Spellcasting Guide
However, even if you get access to a 9th level spell slot, multiclassing won't necessarily give you access to a 9th level spell.