spell slots
Spell Slots in D&D 5e: All You Need to Know!
A Warlock’s spell slots are its biggest weakness. Up until 10th-level they only have two spell slots per short rest, and only ever get up to four spell slots at the 20th-level.
dnd 5e 2014 - Would a multiclassed Arcane Trickster rogue 3 / ...
Arcane Recovery: Replenish spell slots while out of combat. You cannot restore spell slots above 5th level.
Spells | D&D 5th Edition on Roll20 Compendium
Spell slots are the main way a spellcaster’s magical potential is represented. Each spellcasting class gives its members a limited number of spell slots of certain spell levels.