Такого вида запрос получается?
Код:
$talbs->query('SELECT SUM(`BonusTalents`) FROM `mangos`.`quest_template` WHERE `entry` IN (SELECT `quest` FROM `characters`.`character_queststatus` WHERE `status` = 1 AND `guid` = '.$guid.')');
$talent_points = ($char['level'] +$talbs - 55) * $talent_rate;