Here is the code (this is only the part for issuing nbt):
code_language.skript:
set {stellrap} to iron sword
add nbt compound from "{AttributeModifiers:[{Amount:-2.1d,AttributeName:""minecraft:generic.attack_speed"",Name:""Attack Speed"",Operation:0,Slot:""mainhand"",UUID:[I;2104322211,-1159772058,-1615450746,615311383]},{Amount:3.0d,AttributeName:""minecraft:generic.attack_damage"",Name:""Attack Damage"",Operation:0,Slot:""mainhand"",UUID:[I;979656416,861292788,-1657870924,-1065933190]}],CustomModelData:1000005,Damage:0,HideFlags:2,display:{Lore:[""{'text':""""}"",""{""extra"":[{""italic"":false,""color"":""gold"",'text':""Пронизывающий защиту""}],'text':""""}"",""{""extra"":[{""bold"":false,""italic"":false,""underlined"":false,""strikethrough"":false,""obfuscated"":false,""color"":""gray"",'text':""- +5% урон за каждую часть ""}],'text':""""}"",""{""extra"":[{""bold"":false,""italic"":false,""underlined"":false,""strikethrough"":false,""obfuscated"":false,""color"":""gray"",'text':"" брони вашего противника ""}],'text':""""}"",""{""extra"":[{""bold"":false,""italic"":false,""underlined"":false,""strikethrough"":false,""obfuscated"":false,""color"":""gray"",'text':"" (суммируется мультипликативно)""}],'text':""""}"",""{""extra"":[{""bold"":false,""italic"":false,""underlined"":false,""strikethrough"":false,""obfuscated"":false,""color"":""gray"",'text':""- Отключает щиты на 2 секунды.""}],'text':""""}"",""{'text':""""}"",""{""extra"":[{""italic"":false,""color"":""gray"",'text':""Если в основной руке:""}],'text':""""}"",""{""extra"":[{""bold"":false,""italic"":false,""underlined"":false,""strikethrough"":false,""obfuscated"":false,""color"":""blue"",'text':"" 4 Урон""}],'text':""""}"",""{""extra"":[{""bold"":false,""italic"":false,""underlined"":false,""strikethrough"":false,""obfuscated"":false,""color"":""blue"",'text':"" 1.9 Скорость атаки""}],'text':""""}""],Name:""{""extra"":[{""italic"":false,""color"":""white"",'text':""Стальная рапира""}],'text':""""}""}}" to nbt compound of {stellrap}