MetaDoom explained part 3, check this tag to catch up.
Weapons:
MetaDoom has a lot of fun toys. Some of them have designs meant to mix up different designs and elements of certain weapons.
Some also have alt fires as a nod to D4 and to make things more interesting. There's also randomization rules where for you to pick up X, you must get Y first except for the melee weapons for some reason. Also, when switching weapons, it’s a bit quicker when they’re the same slot
FIST:
Has its own keybind as is a simple move that makes enemies drop health pick ups when punched, as in D4 fashion
1st slot: EGM SIDEARM:
Pistol whose design sort of resembles D3 and 4
Has infinite ammo and shoots laser instead of bullets
Alt fire is a lantern, which could resemble D3 BFG edition but it's actually based off D3's duct tape mod (Or at least Xbox version of D3RoE)
Menu option turns off intinite ammo, so it uses bullets as ammo, obviously
2nd slot: COMBAT SHOTGUN:
D64 look but still has a normal reloading animation
Alt fire is D4's grenade shot, costing 4 shells
Drops shell casings.
2nd slot: HOLY WATER PISTOL:
From D2RPG
Main fire deals low damage but makes most foes cry and run like cowards, while instantly killing LS's (Originally, it just stunned them and dealt more damage on LS's and maybe Archies too but less on zombies, but i might be wrong)
Second alt fire refills your health but wastes more water
To refill its ammo, just stand on most liquid textured floors (Originally it was filled with water tanks/fountains and using toilets)
When you refill with water, you may heard a sound that is RPG related
Has its own bindable key
3rd slot: SUPER SHOTGUN:
Has D2's design but with different sprites, animations and Doom Eternal’s meathook, which seems based off the Doom alpha/beta bayonet rifle blades and painted gold
Primary fire is the same
Secondary fire shoots the meat hook and if it hits an enemy, they’re stunned and the hook brings the player to said enemy, which has a lot of traversal potential
Meathook has time based delay if successfully used, hence the lights in the weapon indicating how much time left
If you miss, you can shoot it again
It also works on UV co-op players
The movement itself is not as complex or “web slingy” as Eternal’s
Meathook can also bring some gameplay breaking issues at times, so be considerate
Can show up in Doom 1 sometimes, by replacing Shotty placement
Drops shell casings
3rd slot: FIRE EXTINGUISHER:
Doom RPG weapon that can put up Lost Souls, fireball projectiles and even flames/fires from certain props
Second fire can save you from Archvile's fire attack (I think originally it was mainly used to put up fires blocking paths and deal more damage on LS's and Archies)
Has its own bindable key
4th slot: ASSAULT RIFLE:
Doom 3's machine gun, which sort of resembles classic Doom's chaingun, but apparently it fires one tick faster, due to complaints of it sounding weak
Alt fire is D4's micromissiles, which wastes a lot of ammo and they have a short delay when sticking to enemies before exploding
Drops bullet casings
4th slot: CHAINGUN:
Design mostly represents D64 and 3, but painted blue
Primary fire is obvious, more damage at the cost of waiting times (I thnk it also uses a beta D3 sound)
Second fire: D4's turret mode, unleashing three barrels to do more damage at the cost of ammo (It also prevents you from walking instead of just walking slowly)
Drops bullet casings
5th slot: ROCKET LAUNCHER:
Design represents D1, 64 and 3
Firing sound is Eternal related and fused with 3 firing sound
Alt fire is from D4, detonating rockets in mid air that can drop fragments that deal damage (Based off an upgrade for this alt fire in the game)
5th slot: GRENADE LAUNCHER:
A weapon from D4's multiplayer DLC
Like a traditional GL, its grenades either bounce around and explode shortly after or explode on impact with enemies
Second fire is a gas grenade, that drops short lasting gas, that continues to hurt enemies (Or sometimes you)
Grenade sprites may be Duke Nukem related, while the green cloud is probably from Hexen
In D4, the official GL shoots a harmless smoke bomb but D4's MP has a Plasma Rifle whose alt fire is an harmfull energy floor like a Cybermanc attack
6th slot: PLASMA RIFLE:
Design and sounds represent classic Plasma gun and D3/4 (Could resemble all versions, actually)
Has no recoil
The screen on the weapon shows bars being filled when firing, this is so when they're full, you can use the alt fire
When each bar is filled, there’s sounds from Eternal being used
Alt fire is D4's heat wave, which seems to be composed of stronger Plasma balls than a simple Plasma wave
It also affects your surroundings in a 360 degree angle, something that 2016’s heat wave did but not Eternal
6th slot: LIGHTNING GUN:
D4 multiplayer weapon, whose primary fire is a string of electricity that shocks enemies and wastes a bit more ammo
Alt fire is borrowed from the Plasma gun in D4, which is a harmless projectile that stuns enemies
6th slot: GAUSS CANNON:
D4 weapon, that is pretty much a Quake Rail Gun, kinda
Design sort of represents the original BFG9000 or at least early sprites and the toy they used for it
Primary fire even has that spiral effect from Q2 and Skulltag
Second fire is just a scope for the sake of balance and maybe a page taken from the Vortex Rifle (Its design still resembles one of the Gauss Cannon's alt fires)
If you're too close, it can cause splash damage and hurt you
7th slot: BFG 9000:
Design represents D64 and 4
Uses separate ammo from Plasma gun (Argent core)
Main fire may deal a bit more damage than usual and the projectile can damage enemies nearby, as inspired by D3/4
Second fire is a stream of BFG balls based off an unused BFG fire (It can even bounce on floors/ceilings) but there's no red projectiles
7th slot: UNMAKER:
Doom 64's hellish weapon whose design also represents the Reaper (D4 multiplayer DLC) and because it's originally nameless, it's technically nicknamed after a Doom bible weapon
Like the original, it starts off as an odd cousin of the Plasma rifle, but once you pick up the demonkeys, it fires faster and gets to shoot three projectiles at once (Though it may not be entirely faithfull, at least if you look at that video by Decino or the ClassicDOOM channel)
Said demonkeys can spawn next to BFG/Unmaker spots and in D64 maps (Consolation Prizes), they're where they're supposed to be
Demonkeys also unlock and upgrade an alt fire, where you charge up 1 to 3 laser beams
7th slot: SOULCUBE:
Doom 3's magic cube whose design is based off Doom 2's spawn cube and it smoothly shakes on screen when used
Once picked up, enemies start dropping "soul essance" and you need at least 10 of those to make the weapon work (May be based off D4's MP mode called Soul Harvest)
Once you got 10 souls, you can use the Cube to instantly kill one enemy and they'll drop ammo/health/armor like in D4 fashion
Despite being a BFG replacement, it can replace chainsaw in rare occasions (E2M5, Map 10)
Has its own bindable key
8th slot: CHAINSAW:
It's design and sounds mostly resemble later designs but it's technically just a yellow chainsaw, so it may not matter that much
Primary fire is the same, while second is just a strong and slow swing attack
Press the FIST key and you get an attack that makes enemies drop health goodies
8th slot: FIRE AXE:
Doom RPG's axe, which normally had a black head and yellow handle, but who cares
Primary/second fire: Slow melee attack that makes enemies bleed and drop health for a while, but zombie types die instantly
Can destroy barrels without exploding them, this can be usefull
