After being destroyed, a lich reforms in 1d10 days with all its hit points. When it reforms, must it then complete a long rest to recover the spell slots it likely expended to prevent it's initial destruction?
As described in this answer, the flameskull only regains its hit points, not expended spells. However, the flameskull in that answer reforms after 1 hour, which is not long enough to complete a long rest.
I've tagged this with 5e, but if there is no information within those books, I would be interested in answers from other editions.