I have a question concerning the interaction between using the Heat Metal spell against a target that has cast Disguise Self on themselves.
A character has cast Disguise Self on themselves to give the appearance that they are wearing plate armour (or some similar metal armour). What happens if someone casts Heat Metal on such a target?
Now clearly the Heat Metal spell doesn’t work but does the Heat Metal spell even get cast? Does the caster waste a spell slot? Do they realise the spell has been wasted or don’t get cast?
If the target is wearing some sort of metal armour under the illusion, does that heat up? I assume not since it wouldn’t be visible due to the illusion and therefore couldn’t be the target of the Heat Metal spell.
Can the answers for this specific combination apply to a more general case where a spell targets an illusionary object or creature? What happens in such a case?
