Amphibious. The firenewt can breathe air and water.
Imix's Blessing. When the firenewt reduces an enemy to 0 hit points, the firenewt gains 5 temporary hit points.
Innate Spellcasting. The firenewt's innate spellcasting ability is Charisma. It can innately cast mage armor (self only) at will, requiring no material components.
Spellcasting. The firenewt is a 3rd-level spellcaster. Its spellcasting ability is Charisma (spell save DC 12, +4 to hit with spell attacks). It regains its expended spell slots when it finishes a short or long rest. It knows the following warlock spells:
Cantrips (at will): fire bolt, guidance, light, mage hand, prestidigitation
1st–2nd level (2 slots): burning hands, flaming sphere, hellish rebuke, scorching ray
Morningstar. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit:5 (1d8 + 1) piercing damage.
In regions that contain hot springs, volcanic activity, or similar hot and wet conditions, firenewts might be found. These humanoid amphibians live in a militaristic theocracy that reveres elemental fire in its worst incarnation.