Eveleth's Eruptive Cloak

The caster is wreathed in a swirling cloak of protective flames. A 5' cylinder of fire burts from the caster with tremendous force. Each creature within the area of the cylinder must make a STR Saving Throw, creatures who fail take 6d6 Fire damage, are pushed 5 feet away from the caster, and are knocked prone, creatures who succeed take half as much damage and are not pushed away or knocked prone. Flammable objects that are non-magical and are not being carried or worn in the range burst into flames. The cloak lasts for 1 minute.