Last night my 10th level cleric was casting the wizard cantrip spell fire bolt against a high level cleric. The DM asked me what level spell it was and I said cantrip and he said it doesn't work.
I didn't argue his decision I just accepted it. I'm aware the intended target (high level cleric) could have cast a spell or had some magical item that could negate my fire bolt but not sure how the level of the spell matters. What should matter is the type of spell. But assuming the cleric did not cast a spell and was not using some magic item to negate my fire bolt should my fire bolt be effective against a high level spell caster? Assuming I hit of course.
Are high level spell casters immune to lower level spells? I can't find anything that says that other than higher level spell casters have higher saving throws. But in this case fire bolt only requires the cleric to roll a d20 attack roll and the intended target does not get any type of saving throw. So at a minimum if I were to roll a natural 20 I should have hit even if the intended target was a 20th level spell caster. Am I missing something?