So I have this 3rd level wizard NPC, school of enchantment, with the spells Gift of Gab and Suggestion.

Gift of Gab makes everyone within 5 ft forget the last 6 seconds and replace the memory by something of the caster's choice.

So I was thinking, if you use suggestion on a creature, and immediately follow it up with gift of gab, they would forget you were the person who suggested it, wouldn't they? On top of that, they won't know someone suggested it, as the memory of the suggestion is lost!

What do you guys think?

If it works like this I will definitely use this to troll my players lmao

Gif of Gab only works for the turn it's used on. Suggestion would have occurred prior to the turn GiG was used on.

So, no.

However, Enchantment Wizards do end up getting an alter memories feature that can, indeed, have them make their targets forget the time affected by the spell.

I see your point, but assuming you're not in combat, so not using the turn based system it could, I think.

Since GoG makes he targets forget the last 6 seconds. So if you used suggestion within those 6 seconds it would work.

I would say no, it still takes time to cast the suggestion spell and speak your suggestion (which is actually not part of the spellcasting and happens after).

But, I'm not your DM.

This works if there are two of you, one to cast Suggestion and one to cast Gift of Gab.

That seems like it should work. Suggestion has a casting time of 1 action (which is 6 seconds in combat), Gift of Gab has a casting time of 1 reaction - the timing seems like it works.

Am I missing something? Why wouldn't it work?

Gift of Gab doesn’t make everyone forget the last 6 seconds, it makes everyone forget everything the caster said in the last 6 seconds. So having two casters wouldn’t work.

But as ftl points out, Gift of Gab is a reaction, so two casters aren’t necessary. But, the target of the Suggestion would also forget the suggestion, so whether or not it could still take effect feels like a DM call.

Okay then, thank you! I was wondering if it could work, this helps!

you have the right idea but you are overthinking it. Consider this scenario:

Devil: sell me your soul for all the win.

Me: Nope. no. Never.

<<<Reaction Rewind to change his memory>>>

Me illusion: Abolutely! totally! anything you want!

Devil: Excellent!! Here you go, have all your win good sir!

Later: We never agreed to you having my soul! here see <<Casts Augury >> Does this devil have any claim to my soul? Woe.

Nothing in the text of the Suggestion says anything about the Target needing to remember where the suggestion came from. It specifies that the creature must understand it at the time of casting, that's it.

Suggestion Concentration

 

You suggest a course of activity (limited to a sentence or two) and magically influence a creature you can see within range that can hear and understand you. Creatures that can't be charmed are immune to this effect. The suggestion must be worded in such a manner as to make the course of action sound reasonable. Asking the creature to stab itself, throw itself onto a spear, immolate itself, or do some other obviously harmful act ends the spell.

The target must make a Wisdom saving throw. On a failed save, it pursues the course of action you described to the best of its ability. The suggested course of action can continue for the entire duration. If the suggested activity can be completed in a shorter time, the spell ends when the subject finishes what it was asked to do.

You can also specify conditions that will trigger a special activity during the duration. For example, you might suggest that a knight give her warhorse to the first beggar she meets. If the condition isn't met before the spell expires, the activity isn't performed.

If you or any of your companions damage the target, the spell ends.

But, I guess people can argue one way or the other for RAW. And with that in mind, I consider the following:

• Suggestion lasts 8 hours from the time of casting and human short term memory is shitty, it's within reason to assume that remembering the "suggestion" isn't important, understanding it at the time, is.
• Gift of Gab specifically says it only makes people forget words that were spoken, not that magical effects related to those words are also undone. Reversing or undoing associated magical effects would require a higher level spell based on precedent.

If gift of gab *didn't* remove the memory of casting suggestion because "it only works for the turn it was used on" then by the same logic gift of gab wouldn't work on anything.

in my campaign, we paired GoG from my wizard with a high insight Cleric to essentially do a "hidden interrogation"

We approached the subject and:

Wiz: are you connected to [topic of interrogation]
Cleric to DM: What was the subjects reaction? *rolls insight high

DM: He seemed scared at the mention of [topic]
Wiz: *GoG: How are you today sir?

Target: Oh I'm fine!

Repeat for as many spell slots as you can spare lol

Sigh.

And the Dread Necromancer Th'redd sinks his gnarled, bony fingers into another corpse of discussions long past.

Worth noting: Suggestion does not alert the target to having been the subject of a spell.  This is something A LOT of people get wrong.  Unless the spell says "your target becomes aware of having been manipulated" a'la Charm Person, then unless the target has reason to believe it's been manipulated it has no idea.  Suggestion could be as easy as casting the spell from behind the intended target so they don't witness the cast, then saying "Good sir!  Might I suggest you allow us passage into your city?  We're ever so eager to explore its attractions!"  The NPC might later wonder what the hell they were thinking, breaching their orders to allow someone through, but if they did not witness the finger-waggling and magical chanting of a spell, they have no immediate reason to suspect magic unless mind-altering magic is common enough in your world that guards are trained to try and recognize its effects.  "He cast Suggestion on me!" is not something the average NPC village commoner would have remotely enough knowledge or education to say.  They may very well accuse you of the evil eye, especially if you make a habit of frequently muddling with NPC brains, but DMs just allowing their NPCs to have perfect knowledge of the spells PCs use is as much metagaming as PCs knowing the exact function of every spell they see simply because the players do.