These are mods that were formatted by me TG some of these sprites were made by others, but I formatted them and put them into mod form
to install these mods, just drag all of the included folders into 
"The Genesis Project\The Genesis Project_Data\StreamingAssets\ItemCache" for the game to recognise them
The Royal deringer && the smoke pellets will get you the Cobalt blade, which is the base for almost all of my items
The cobalt blade && The cobalt blade will get you the Dual Cobalt blades
The cobalt blade // The warhammer of zillyhoo will get you the moonlight greatsword
The moonlight greatsword // royal deringer will get you the master sword

And best of all, the katana && the perfectly generic object will get you THE MOTHERFUCKING FUNNY SWORD

Undyne's spear has no recipe currently 
Neither does the baby bat

The item codes are 
swodswrd = cobalt blade 
swrd&sld = dual blades
undynesp = Undyne's spear
mstrswrd = Master sword
mnltswrd = The moonlight greatsword
Funnysrd = the funny sword 
babybat1 = the baby bat