Amphibious. The firenewt can breathe air and water.
Multiattack. The firenewt makes two attacks with its scimitar.
Scimitar. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit:4 (1d6 + 1) slashing damage.
Spit Fire (Recharges after a Short or Long Rest). The firenewt spits fire at a creature within 10 feet of it. The creature must make a DC 11 Dexterity saving throw, taking 9 (2d8) fire damage on a failed save, or half as much damage on a successful one
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.