Warlock spell slots work a little differently than other classes. Each spell has a certain number of “charges” which are used up when the spell is cast. The number of charges is listed in the spell’s description. For example, the fireball spell has a 3 charge limit.
Once all 3 charges are used, the spell can’t be cast again for that day. Warlock spell slots are similar, but instead of charges, they have “power points.” There is a limit to how many power points a warlock can have at any given time, and when all of those are used up, the warlock can’t cast spells for that day.
