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Message: <blockquote data-quote="Sword of Spirit" data-source="post: 8230767" data-attributes="member: 6677017">"Otherwise, you perceive that the spell did nothing to the target."That's the tricky part. It seems to suggest that if you are dealing with a spell that doesn't allow a saving throw, you automatically know (perceive) that it doesn't work when you cast it on an invalid target. This turns those (admittedly rare) spells into valid/invalid target detectors. That seems to run contrary to the tone of the section, which otherwise presents it so that you don't get to use charm person as "detect non-humanoid".It's possible that it's just less than clear phrasing and the intent was something like, "Otherwise, you do not notice any effect from the spell." Or even better, that last sentence could just have been left out entirely, since that concept should follow from the rest of the section.I'm probably going to stick with the idea that spells that don't require concentration are fire and forget, and your only way of knowing if they work is by observing the effects (either physically, or with magic such as detect magic or identify). For a concentration spell, I assume you know when the spell is using your concentration, so you know on that basis.</blockquote>