Beam of Searing Light

The caster draws upon the power of their holy devotion to destroy evil with gratuitous prejudice.  The caster fires forth a 10ft wide, 10ft tall, 150ft long searing beam of light that sears with the power of fire and holy energy.  Any creature caught in the beam must make a dexterity saving throw or take 4d8 radiant and 4d8 fire damage, half damage on a successful throw. Undead, fiends, aberrations, devils and demons make the dexterity save at disadvantage.  Any creature that fails the dexterity saving throw must also make a constitution saving throw or burn with deep holy energy, taking an additional 2d6 radiant damage a turn until the creature(s) make a successful constitution saving throw.