I have a problem about the spell Suggestion. One of my players wants to use it on an NPC and the NPC fails the save, does the 'thing' he is told to do and now ____. Does the NPC 'magically' forget about the spell? Or in other words, can someone remember that a spell was cast on them (specifically Suggestion)?
Here is something I thought about with regards to the Friends spell (PHB P.244):
...When the spell ends, the creature realizes that you used magic to influence its mood and becomes hostile toward you...
So, Suggestion doesn't have that in its description, neither does it have something similar. Does that mean this is just not the case with Suggestion? And if so, with every other spell, where said sentence or a similar are not stated?
Or did they just attached this sentence to the spell Friends to clarify 'If he wasn't your enemy before, he is now'.
So, here again the question is: Are you able to recognize that a spell is being cast on you after you've fulfilled your 'suggested' task via the spell Suggestion (or a similar Spell)?