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Message: <blockquote data-quote="Shayuri" data-source="post: 4954561" data-attributes="member: 4936">Spell like abilities have no verbal or somatic components, but they still require a moment of concentration to activate. A person can recognize that (as well as unspecified, presumably subtle, cues) as an ability being used, which is what triggers an AoO if you're threatened. Spell Like abilities can't be countered though...and I don't know offhand if they're subject to identification until their effects can be observed.In short, you can tell a 'spell' is being cast (and hence take your AoO), but you won't necessarily know WHAT spell until you see the results. It's reasonable to assume that someone specifically and closely observing a character would notice that he was using an ability of some kind (though some observers might not realize it was magic, and just think the character was distracted for some reason). A character who is being quiet and unobtrusive might be able to use an ability without attracting attention though. No rules for this, but it wouldn't be hard to improvise.Supernatural abilities lack even that moment of concentration, in general.</blockquote>