Thermal Transference

You steal the thermal energy of a creature you can see within range. The target takes 5d8 cold damage, which can't be reduced in any way. An unwilling target that succeeds on a Constitution saving throw is unaffected.

If the target was a willing creature, or an unwilling creature that failed the saving throw, you steal a mote of thermal energy from the target, which lasts for the duration. While you possess the mote of thermal energy, you have resistance to cold damage. As an action while you possess the mote of thermal energy, you can transfer the mote. Choose one of the following options:

Thermal Blast. You can transfer the mote's thermal energy as a blast of heat to a creature you can see within range. The target must make a Constitution saving throw, taking 5d8 fire damage on a failed saving throw, or half as much damage on a successful one. Doing so ends the spell.

Thermal Protection. You transfer the mote to a willing creature. While that creature possesses the mote of thermal energy, it has resistance to cold damage. At any time before the spell ends, you can use an action to transfer the mote of thermal energy back to you, if the creature that possesses it is currently within range.

Thermal Restoration. You transfer the mote back to the initial target as restorative warmth. If the target is within range, it regains 5d8 hit points. Doing so ends the spell.