Before this starts: Magic Missile does not auto-hit. It auto-damages.
'Yeah, but I know that technically, but it acts as tho it auto-hits.'
Apparently not enough people understand this, so it has to be corrected again. Stop saying it auto-hits. It does no such thing.
???
I didn't say anything about the thief. I was talking about the hunter ranger, who uses modified ranged basic attacks (which Magic Missile clearly is).
Good point. Regardless, it doesn't matter. Both the scout and the hunter ranger builds require that you 'hit with a' or you 'hit or miss with a' or you 'make a damage roll' or 'make an attack roll' regarding the basic attacks they refer to.
Magic Missle never makes an attack roll, never makes a damage roll, never hits, and it never misses, so it never triggers an essential ranger's aspect.
About the only shinanegan that works here is the Hunter's at-will that allows them to make ranged basic attacks to every enemy adjacent to or in a targeted square. Bonuses to attack rolls, damage rolls, or that key off of the results of a hit or a miss can
never work with Magic Missile.
(I had also forgotten that they had errataed that feat that made Magic Missile a melee attack so that the feat was now shadar-kai only. Which means that Knights can't use the weird auto-hit function of MM. There's no way for a shadar-kai knight to get MM as an at-will at this point.)
Again.... Magic Missile (the current one) does not and never has hit anything. Every stance a knight has says 'when you hit with a' which immediately precludes any sort of shinanegans involving Magic Missile as it never hits anything.
However, let's say, hypothetically, you DO hit with an Implement power that counts as a melee basic attack. You can only Power Strike as an e-fighter if you are using a weapon with that power, and if you do, the weapon stats are what power strike uses with it.