Stonetail's Kindlewreath Armor

Stonetail's Kindlewreath Armor is a 6th-level Transmutation spell created by Elstan Stonetail, with the idea based around Roshké's Wreath of Ignition ability.

Description
Stonetail's Kindlewreath Armor requires one action to cast, requiring verbal, somatic, and material components. The material component is a firefly and a piece of bark.

A protective force manifests around the caster, taking the form of a number of flaming wreathes that swirl around them and their gear. The caster gains temporary hit points equal to 10 plus their Spellcasting Modifier for the duration. If a creature hits the caster with a melee attack while the caster has these hit points, the creature takes fire damage equal to half the damage they hit the caster with, to a maximum of 10 points. In addition, whilst the caster has these hit points, they are resistant to cold damage.

When cast at higher levels, both the temporary hit points and the maximum fire damage increase by 5 for each spell slot level above 2nd.

Description
The spell was developed over time by Elstan Stonetail with inspiration from his companion, Roshké while they travelled together. The spell utilises a similar swirling fire visual effect, though is more effective with abjuring energy as opposed to being a single attack like Roshké's ability. The spell is somewhat similar to Armor of Agathys.