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Message: <blockquote data-quote="Lord Twig" data-source="post: 6906872" data-attributes="member: 31754">I'll stick with the numbers...1) I like the addition of an Investigation check. It adds more use to that skill. So I'm going to use that.As for the cantrips Acid Splash, Eldritch Blast and Ray of Frost target creatures. Fire Bolt targets a creature or object. I could say that Acid Splash and Ray of Frost hit objects and do nothing, just like I rule for Magic Missile, but this seems odd to me. Since they are elemental spells, I will probably allow Acid Splash, Fire Bolt and Ray of Frost to effect creatures, objects or locations, just like an attack. I'm on the fence about Eldritch Blast. It is a force effect, like Magic Missile, but it requires an attack roll like Fire Bolt or Ray of Frost. But this is firmly in house rule terrain. If I wanted to stick closer to RAW I would just have them work the same as Magic Missile.2) I probably just muddied the waters with this example and should have left it out. You are right, there are specific rules for attacks against invisible creatures and they can target locations. But the fact that spells have no such rules means that you have to make a ruling in the rule's absence. Based on my interpretation of the RAW I made my own ruling.3) Oh absolutely. I would inform the caster of how his spells would interact with invalid targets in advance.If I understand correctly, your interpretation is that you target the enemy with Mirror Image and the Magic Missile spell, since it automatically hits, ignores the images and hits the target with all missiles? That's a fair ruling. I would be perfectly content as a player if my DM went that way. Honestly this might be the correct way by the strictest reading of the RAW.I guess I am influenced by past editions where you would actually roll to see which image you hit. Since Magic Missile hits everything simultaneously, none of the images could move before all of the missiles hit. Likewise any spell with a duration of instantaneous would hit so fast that there wouldn't be time for the images to move. But again this probably falls into a house rule, but I'm fine with that.What I don't believe falls into a house rule is targeting spells against invalid targets. If a spell says you can only target creatures and you target an object, the spell fails because the target is invalid. I don't believe the RAW implies you are just incapable of casting the spell.Consider another example. What happens if you cast Hold Person on a dragon that is Polymorphed into a human? I would rule that you cast the spell and it failed to work. The caster might just assume that the target made their save. Or I might allow a Spellcraft or Investigation check to realize that the target isn't actually human, depending on the situation.</blockquote>

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