For SuperTotalCarnage! players, this is a weapon combos guide which explains the items to combine to get upgraded weapons.
Will be updating this as I find more. I’m finding this through trial and error and might be wrong, so please let me know if I am.
Spree Killer = Mitra (machine gun) + Guanto Saetta (gloves) (increase projectile speed)
Er Metano = Molotov + Sleppa (increase duration weapon effects)
Bajocco = Canne Mozze (shotgun) + Ok capo (toolbox) (reduce cooldown)
Sbarajone = Palla Chiodata (ball-on-chain) + Chiodi daa Croce (nails) (increase damage)
SPATA = The Scrocchi (sword) + Core de sta città (heart) (increase health)
Se Ciao = Bazzuca (bazooka) + Mano di S. Bartolomeo (hands) (increase pickup range)
Disco Inferno = Moooosega (chainsaw) + Lanterna in mano ai cecati (lantern) (increase attack area)
Bombe calde a grappolo = Bombe calde (grenade) + shoes or health regen
Er Briberòn (bottle) (health regeneration)
Scarpette (shoes) (increase movement speed)
Occhi di S. Lucia (eyes) (increase projectiles)
Capoccia de Papa (skull) (increase XP gain)
Sacra Sindone (shroud) (reduce incoming damage)