Actually, for once, it's a quite good implementation of the 5e ruleset. :)
In the Player Handbook (p.147) :
Improvised Weapons
Sometimes characters don’t have their weapons and have to attack with whatever is at hand. An improvised weapon includes any object you can wield in one or two hands, such as broken glass, a table leg, a frying pan, a wagon wheel, or a dead goblin.
Often, an improvised weapon is similar to an actual weapon and can be treated as such. For example, a table leg is akin to a club. At the DM’s option, a character proficient with a weapon can use a similar object as if it were that weapon and use his or her proficiency bonus.
An object that bears no resemblance to a weapon deals 1d4 damage (the DM assigns a damage type appropriate to the object). If a character uses a ranged weapon to make a melee attack, or throws a melee weapon that does not have the thrown property, it also deals 1d4 damage. An improvised thrown weapon has a normal range of 20 feet and a long range of 60 feet.
Improvised Weapon is also an ability in the game you can use at any time. If you're strong enough, you can even use gnomes and goblins as weapons! I killed a skeleton by throwing a rat at it in one of the later dungeons.
My monk is just Jackie Channing his way through combat. Punching, kicking, throwing chairs, swinging tables... I walk into a room and I look at every object in it and devise a way to utilize everything in battle. It's awesome. 😃
I found 9ut you could use salami as a weapon when I was doing super little damage in a fight. IDK how they got equipped, but I immediately went and started a new game as a monk specifically to throw boxes and beat people up with deli meats.
They are the best weapons! Watch this video for proof :) (Not my video, algorithm showed it to me, perhaps I'm searching a lot of BG3....)
https://youtu.be/Nmal1GmyiKA