User blog comment:AKFrost/Halloween Conq Leaks/@comment-115.64.209.51-20131022020321/@comment-10259858-20131022031215

there are 3 type of booster daemons, the one that increase HP, atk and the one that increase point earned

both HP and atk will be increased by 30% of your current stat (remember that the one that increase atk does not increase your max HP as the value is different than normal atk)

the point one will double your conquest point. It does not always double the point, most likely, the chance is also 30%, but I'm not sure

There are also mags with the same special eff except that it gives less increase compare to special daemons