rogue spell slots
Realistic Short Rest - Resurrected at Baldur's Gate 3 Nexus - ...
Warlocks specifically use Warlock Spell Slots that can be replenished upon a Short Rest. Clerics and Wizards have regular Spell Slots that can only be replenished by having a Long Rest at camp.
D&D 5e Multiclassing Spell Slot Calculator
Restore 2 spell slots of up to 3rd level or 1 spell slot of up to 5th level.
Counterspell at lower level spell slot?
In Tier 4, (Levels 17-20), the first level gains the 9th level spell slot, but then all the other levels give lower level spell slots.