Keen Senses. Has advantage on Wisdom (Perception) checks that rely on sight, hearing, or smell.
Limited Telepathy. They can magically communicate simple ideas, emotions, and images telepathically with any creature within 100 feet of it that can understand a language.
Bite. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 5 (1d10) piercing damage.
Barbed Claws. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 5 (2d4+2) piercing damage and it can attach to the target. While attached, the Runt Dragon has advantage on its next attack. The Runt Dragon can detach itself by spending 5 feet of its movement .
Lightning Breath (1/Long Rest). The dragon exhales lightning in a 15-foot line that is 5 feet wide. Each creature in that line must make a DC 12 Dexterity saving throw, taking 11 (1d10+6) lightning damage on a failed save, or half as much damage on a successful one.