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I don't talk of Wizards which clearly have an exception with their spell book to preparation and casting of rituals. In my specific situation I ask about a Cleric or Warlock with the Ritual Caster feat casting a ritual.
Would a Cleric or Warlock with no spell slots left for the day but originally prepared the ritual spell still be able to cast it as a ritual despite lacking spell slots for it?
The ritual version of a spell takes 10 minutes longer to cast than normal. It also doesn’t expend a spell slot.
Clearly you don't need to use a slot to cast a ritual spell, and thus there is no reason you would need to have one available. To cast a ritual spell you simply cast it using the ritual casting rules. No slots needed.
Requiring such a thing would completely undercut the usefulness of ritual spells since using slots is what casting as a ritual is intended to avoid.
The section on rituals in the Player's Handbook states:
The ritual version of a spell takes 10 minutes longer to cast than normal. It also doesn’t expend a spell slot
No matter what source your ritual spells come from, you don't need a spell slot to cast them as long as you have a feature to cast rituals with.
