Thank you for your patience.

The “Halves avatar perpetuation cost“ effect on “Caller's Bracers +1” and “Caller's Bracers +2” does not work the same way as “Carbuncle Mitts.” It halves the total avatar perpetuation cost attained from all your equipment instead of the base amount. Therefore, you will end up with different results depending on the other items which effect the avatar perpetuation cost (i.e. Caller's Doublet +1).