Mastery of Life

Life Mastery:

You have devoted your life to protecting others, going so far as to delving deep into the secrets of harnessing even the most devastating powers to restore life instead.

As an action, you may sacrifice your own life-force, reducing your current hit points by any amount of your choice (this can not be reduced in any way). You may then immediately disperse healing to 5 times the value sacrificed, it may be distributed between any amount of allies (not including yourself), for an amount no more than half of their total max hit points. If a creature receives an amount of healing that exceeds their full health amount, they may add the remainder of points to their temporary hit points (If at full health THP amount awarded this way cannot exceed a value greater than half their max hit points). Temporary hit points only remain until the end of combat but are stackable with your  other temporary hit point effects

You may use this ability once per short or long rest, unless you expend a usage of your Channel Divinity to do it again.