In D&D 5e, when using the Variant: Dragons as Innate Spellcasters, a spellcasting young red dragon is going to know 4 spells of up to 3rd level and can cast each spell once a day.
When the dragon casts, are the spells cast at 3rd level or at the lowest level for the spell?
Eg, does the dragon cast cure wounds at 3rd level, because it can?
Could the dragon cast invisibility on itself and its pet by casting it at 3rd level?
Best Answer
Dragons cannot upcast innate spells
The MM says this on innate spellcasting (p.10):
This is not circumvented by the rules for dragons (p.86)
The latter is about what spells the dragon knows, not about the spells they cast.