Field Medic
You learn the Spare the Dying cantrip. You can cast this cantrip as a Bonus Action. Additionally, when you cast it on a creature that has 0 Hit Points, the target regains 1 Hit Point and gains Temporary Hit Points equal to your Warmage level, which last for 1 minute.
Once a creature regains Hit Points from this trick, it can’t do so again until it finishes a Long Rest.
Sources
Valda’s Spire of Secrets (2024)