Martyrdom

Martyrdom is a 5th level feature of Light, when you choose Peace as your first focus.

Effects
Martyrdom allows you to gain temporary hit points equal to your hit point maximum. Choose up to 10 creatures you can see. For the duration you take all damage those creatures would take instead. You cannot end this effect early and it continues even if you are reduced to 0 hit points.

You can take advantage of this feature once per long rest.