How can I use lower level spells in higher level spell slots?

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On one of my recent Baldur's Gate 3 mechanics videos talking about spellcasting, a

At Higher Levels: When you cast this spell using a spell slot of 3rd or 4th level, you can maintain your concentration on the spell for up to 8 hours When you Mages and Sorcerers can however gain additional slots as high-level class ability, and most classes can use certain items to

book of ra online free slot Spells and spell slots also have levels, with stronger spells being precious commodities thanks to their strength and the limited number of high level spell from the Druid spell pool Spellcasting ability is Charisma Get one spell slot, learn two cantrips, and a level 1 spell from the Warlock spell pool