base amount meaning in English

基准额
消费金额

Hindsight : increases the base amount of tiger effect
：增加老虎效应的基本量。
Confidence : increases the base amount of driver condition
：增加车手状态的基本量。
Drain mana now scales slightly with shadow spell damage , but the base amount of mana drained has been reduced
吸取魔法现在享受些许(不知道这个些许怎么计算, ? )暗影伤害加成,但是魔法吸取的基础值已经降低了