Spark-dragons

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(From Tolkien Gateway page) Spark-dragons were a breed of dragons of whom all that is known is from the nomenclature by the Eldar.[1] No story tells of their appearance in the history of Arda, but one can assume that somehow they radiated light (and therefore perhaps were related to, or were another name for, the great glow-worms).

Names and Etymology
"Fealóke" is the name for this breed in Quenya, consisting of fea ("spark"; from root PHAY-, "radiate, send out rays of light") and lóke ("dragon"; from root LOK-, "great serpent, dragon").

Portrayal in Adaptations
In these games, "Light-drakes" were seen in the game as a kind of dragon breeds(see the Tolkien Gateway page).

1982-97: Middle-earth Role Playing: Light-drakes (Quenya Kalalóki) are rare, wingless Dragons. They prefer to fight with their tails, which hold an electrically charged fluid that delivers "a 'sting' analogous to the impact of a lightning bolt".

1995-8: Middle-earth Collectible Card Game: "Light-drake" is a Creature of the Drake-kind, able to inflict two strikes.