BB Gauge Consumption Reduction

:Not to be confused with BB Gauge Reduction and BC Cost Reduction.
BB Gauge Consumption Reduction (also known as BB gauge cashback) is a passive effect that reduces the amount of BC consumed after using BB/SBB by a specific amount. This effect can be stacked with itself.
==Examples of stacking==
*A unit equipped with Glacies Staff under Inferno Rifle Bestie and Cardes the Malevolent's Leader Skill would have 50~100% BB gauge cashback upon using BB/SBB.