2) Can I cast these spells with spells slots? If not normally, then what about if my main class already knows the spell? (Ex: I'm a Cleric, but I choose detect magic from a Wizards list.) If I can, then can I use my divine focus?
No. You could only use one of your spell slots to cast the spell as a Cleric if you already had it prepared that day. But at that point you aren’t casting it as a Wizard spell with the Ritual tag, you are simply casting it as a regular spell.
For ritual caster feat:
1) What happens if the book is destroyed?
2) Can I cast these spells with spells slots? If not normally, then what about if my main class already knows the spell? (Ex: I'm a Cleric, but I choose detect magic from a Wizards list.) If I can, then can I use my divine focus?
Thanks in advance!
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Awesome! Thanks again!