hey guys i found out how to add custom vendors to your database when wow vendetta wont work for u
i personally had the cannot find invisiblity thing so i looked to some templates and made this i tested it and it works i hope it helps u
INSERT INTO `creature_names` VALUES ('entryid', 'name', 'subname', '0', '4', '0', '3', '0', '0', 'displayid', '0', '0', '1', '1', '1', '0', '0');
INSERT INTO `creature_proto` VALUES ('entryid', '100', '100', '1741', '1000000', '1000000', '100000', '1', '4', '100', '10000', '10000', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '1', '5', '5', '5', '5', '5', '5', '5', '1', '1', '', '0', '0', '0', '0', '2.5', '8', '14', '0');
entryid= add your entry id custom 1
name= name u want for ur vendor
subname= his subname :P
displayid= display id of the npc u want
goodluck with it