the only problem on your custom item is your
ACCESSORY_HELM_OF_GM = 874,
ACCESSORY_MYSTIC_VALKYRIE_HELM = 875,
ACCESSORY_VALKYRIE_HELM = 876,
ACCESSORY_VENDETTA_MASK = 877,
ACCESSORY_SNIPER_HELM = 878
}
this is already use by the other items.
try to make it
ACCESSORY_HELM_OF_GM = 1000,
ACCESSORY_MYSTIC_VALKYRIE_HELM = 1001,
ACCESSORY_VALKYRIE_HELM = 1002,
ACCESSORY_VENDETTA_MASK = 1003,
ACCESSORY_SNIPER_HELM = 1004
}
and make it sure that it will not reach your max item on your client diff. increase max headgear view id.
and for your itemdb
25010,Helm_Of_GM,Helm of GM,5,10000,,10,,10,,1,0xFFFFFFFF,7,2,256,,0,0,1000,{ bonus bAllStats,500; bonus bIntravision,0; },{},{}
25011,Mystic_Valkyrie_Helm,Mystic Valkyrie Helm,5,10000,,10,,10,,1,0xFFFFFFFF,7,2,256,,0,0,1001,{ bonus bAllStats,3; },{},{}
25012,Valkyrie_Helm,Valkyrie Helm,5,10000,,10,,10,,1,0xFFFFFFFF,7,2,256,,0,0,1002,{ bonus bAllStats,3; },{},{}
25013,Vendetta_Mask,Vendetta Mask,5,10000,,10,,10,,1,0x00020000,7,2,256,,0,0,1003,{ bonus bAllStats,3; bonus3 bAddEffOnSkill,"RG_BACKSTAP",Eff_Bleeding,1000; bonus2 bSkillAtk,"RG_BACKSTAP",1500; },{},{}
25014,Sniper_Helm,Sniper Helm,5,10000,,10,,10,,1,0x00000008,7,2,256,,0,0,1004,{ bonus bAllStats,2; bonus bLongAtkRate,15; },{},{}