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Deceit - Basically, John Murphy rolls a natural 20 on his bluff check, every time. He can walk up to a person, tell them 'I am a grizzly bear', and if he's activating this power, that person will be staring at his very human face and completely believe they're seeing a grizzly bear. It has to be a lie he tells someone directly - they have to be able to at least hear his voice to have it work - and it alters their mental perception, not actually turns him into a grizzly bear or casts any kind of illusion that others would see (unless he's using it on a group of people, but the illusion's still only in those peoples' heads). So, for instance, a security camera would catch him as just John Murphy, rather than a bear. This power will last for up to about an hour or so with 100% accuracy. He'd have to reinforce it with another cast by that point, but it'll start to get wobbly - may not hold, especially with people of particularly keen observation and perception skills, or they may just start going into general confusion rather than knowing for certain what he's telling them is the truth. It'll also start becoming more and more mentally taxing on him to keep it up, so he can't do it for, like, days on end without breaks in between.
As for the aftermath, with NPCs never remember who they saw or what the truth of the moment was - only what Murphy told them - and if it was particularly ridiculous, like "i'm a grizzly bear" they'll just be vaguely confused on what the fuck happened and where the grizzly bear went. For PCs, I'll leave it up to player discretion (and this will, of course, have a permissions post to opt-in) on how much they do or do not remember, and cite that the nanites make the effect of that have hiccups, with the idea that it's supposed to work with them like it does with natives, but not always, so we have wiggle room.