Death Burst. When the mera dies, it explodes in a burst of elemental ice. Each creature within 5 feet of it must make a DC 10 Dexterity saving throw, taking 4 (1d8) cold damage on a failed save, or half as much damage on a successful one.   Extinguished. Upon taking fire damage, the mera must succeed on a DC 10 Constitution saving throw or fall prone, the elemental energy within it having been extinguished.   False Appearance. While the mephit remains motionless, it is indistinguishable from ordinary ice.