Oh i know you didnt ...
You wanted only people to nod that this battle is overwhelmigly hard ... well, "it" is not ... you just made it so hard. :-/
[shaking my head] Dude. No matter what way you look at it, it's too hard. Tabletop, videogame, using Larian Cheese, it's too hard. Yes, I've beaten it many times, but 4 Githyanki Warriors fighting 4 Level 4 characters would be considered a Deadly fight by just about any DM in the world who plays Dungeons and Dragons. A Deadly Fight is considered the most challenging Challenge Rating out there. If you add Larian cheese to it, allowing the Githyanki to get advantage from height, and the battle is even harder. Unlike you, they can teleport up to high ground and suddenly gain advantage against you. Then, they get multiattack and can each attack you twice each turn. They gain an extra 2d6 psychic damage with each hit, and one of them is a RANGER who is really good at shooting you from high ground with Hunter's Mark. One of them is a healer too, which makes it even harder because that healer can restore HP to his already beefy allies. And then, to top it all off, it is made even harder because one of them is some sort of invisible assassin ninja who wields two weapons, and one of them is poisonous.
So yes, can it be done? Absolutely. I've done it in the video game and the party of 4 in the Tabletop succeeded. However, in the video game I have to pretty much fight that battle three or four times to get through it, hoping that luck will be on my side this time - EVEN IF I USE ALL THE POTIONS AND SUCH TO BUFF MY CHARACTERS BEFORE THE FIGHT.
And in Tabletop, I had to hide my Gith rolls a few times and say they missed, or the party would have died within only two or three rounds. I'm telling you, the fight is too hard for a fight at this point in the game, and as many have even stated, it is too easy to get there and you could even be attempting it at Level 3. Nope. Needs to have more roadblocks so that the PCs have the ability to level up to at least Level 5 before facing them. Either that, or there needs to be an increase to party size to allow for a party of at least 6... even with buff items like potions and such.
