I'm thinking about haveing a Spider Clan in my OA camp and wanted some of the more powerful members to be half-spider half human, like the Drider. I wanted most of them to be fighters so I'd like to get rid of their spell casting ablility. I've looked at Savage Species and thought about just giving them the base first lvl abilities and then advancing them from there as fighters. How could I add on some of the monster abilities such as Bite and Poison? Would they be equal to a feat? If so one feat for both? or one each?