Actually, you control your DM in a different way.
Fangs have an Int of 10.
Fang: "We all stay here till magic fire run out. Then we fight."
He wasn't being touched buy the
flaming sphere. Just his guys. They did retreat. The mage used his familiar to guide it down the tunnel. Suffice it to say, our tactics matched what they tried.
Alternatively, just use the Shove action. Run up and shove the Monk or Fighter 5 feet out of the way behind the other PC and move into his space. The two gnolls in front each get one shove per round. Sure, it might not happen the first round (Gnolls are pretty strong though), but sooner or later, the gnolls break through. Narratively, 23 Gnolls of 14 and greater strength just push through the line of the Monk and Fighter. Mechanically, the two gnolls in front push the a PC 5 feet back behind the other PC and then all of the Gnolls move down the congo line through that breach as far as their movement allows them. One of them will take an OA from the Monk and one of them will take an OA from the Fighter, but many of them break through nonetheless in a single round.
Gnolls with a 14 strength and no athletics skill to speak off are pretty strong eh. The odds are still not in their favor.
This is what would narratively happen when 23 200+ pound gnolls rush down a corridor. They would overwhelm the two defenders at the end of it. It's not that the Gnolls are so smart that they would use the Shove action instead of attacking, it's that mechanically, this is the main tool that the 5E game system gives DMs and players to have a group of rushing characters (PC or NPC) bust past a front line.
Have you ever seen a panicked crowd rush down a hallway? That is what should happen here.
Or the Fang would think he was going to win with his sons and attack the person in front of him. Which he did, which is also a completely reasonable course of action.
The monsters shouldn't just calmly wait at the other end of the corridor, waiting for their turn to die.
They did not. They conga lined archers behind their fang leader thinking he and his sons would win.
Sorry, but your DM is not using the tools at his disposal.
He certainly did. Your second guessing after the fact because you don't play that way. I see no reason why gnolls wouldn't fight a few rounds thinking their chieftain and his sons would win. We took him down very quickly. Like I said in other post, damage is heavily in our favor.
Your group of super tacticians and optimizers would be so smoked at my table if you begged me to throw CR 8 challenges at you at level 3.
You would come to throw those encounters at us and we could smoke them. You're playing armchair QB right now without realizing how fast things went down or how much damage a group of characters can do even at level 3. I can't explain to you the round by round that went down and I'm not going to. We won fair and square using solid tactics against tactics gnolls would use.
No, we wouldn't. Armchair QBing aside, the tactics were well-executed and involved more than I'm listing. I listed the final area we fought. We took out part of the gnolls prior to that enegagement. Which is why the chief massed his tribe to start with and came with the rest of his living gnolls.
I'd bet money we smoke your CR 8 encounters against gnolls. They're weak. There was a lot more to the encounter than I'm going to take the time to post on this board. We staggered our ranged attackers to hit the gnolls as they were running after us. Explaining every single tactic that went into that fight would take too much time.
I'd bet money we smoke your CR 8 encounters under the same conditions. I'd bet money it would only become worse for you as we gained levels until you were doing exactly as we do: making CR encounters far above normal just to provide some kind of challenge.
You want to talk some smack from afar because you hear a little piece of information and think of a way to counter it after the fact. When you were in the moment, you would be experiencing what we were doing and seeing that you didn't have much means to turn it against us. If you did try your tactics, you would find us adjusting ours.