you can just add script on your item.
item_db.txt
13414,Elemental_Sword,Elemental Sword,5,20,,1200,105:95,,1,3,0x000654E2,18,2,2,3,70,1,2,{ if(isequippedcnt(13414)==1){ bonus bStr,2; bonus bInt,4; bonus bDex,1; bonus2 bAddEle,Ele_Neutral,10; bonus3 bAutoSpell,"MG_COLDBOLT",3,50; bonus4 bAutoSpellOnSkill,"MG_COLDBOLT","MG_FIREBOLT",3,1000; bonus4 bAutoSpellOnSkill,"MG_FIREBOLT","MG_LIGHTNINGBOLT",3,1000; bonus4 bAutoSpellOnSkill,"MG_LIGHTNINGBOLT","WZ_EARTHSPIKE",3,1000;} },{},{}
item_comb_db.txt
13414:13414,{ bonus bStr,2; bonus bInt,4; bonus bDex,1; bonus2 bAddEle,Ele_Neutral,10; bonus3 bAutoSpell,"MG_COLDBOLT",3,50; bonus4 bAutoSpellOnSkill,"MG_COLDBOLT","MG_FIREBOLT",3,1000; bonus4 bAutoSpellOnSkill,"MG_FIREBOLT","MG_LIGHTNINGBOLT",3,1000; bonus4 bAutoSpellOnSkill,"MG_LIGHTNINGBOLT","WZ_EARTHSPIKE",3,1000;}
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