Yonggary

Yonggary ヤンガリー (Yangarī) is an ancient reptile who first appeared in the 1967 film, Yonggary.

Yonggary
Yonggary was an ancient reptile who was awoken by a bomb going off in the Middle East, and a resultant Earthquake which travelled through the Earth to his underground home. He rampaged across South Korea in search of Gasoline and Oil, his favourite foods. After an attack on a refinery in which Yonggary displays a weakness to Ammonia, the South Korean government lure him to a river by covering it in oil, and then covers Yonggary in the Ammonia when he arrives. Yonggary dies an excruciating death through bleeding from most of his orifices, leaving South Korea safe once more.

Reptilian
TBA

Durability
In the film Reptilian, Yonggary was immensely durable, able to shrug off attacks from jet fighters and airborne soldiers. His durability also granted him great strength, enough to even keep a building from collapsing onto the ground below.

Fire Breath
Yonggary can breathe a concentrated stream of fire from his mouth.

Fireball Generation
Yonggary also displayed the ability to produce fireballs from his mouth. It is unknown how many he can fire at any one time, but they possessed enough force to destroy jets and kill Cykor.

Horn Beam
In the Showa film, Yonggary was able to fire a thin, yellow beam from his horn that could slice through almost anything. However, it was only used once.

Weaknesses
Despite Yonggary's impressive durability and abilities, he has one major weakness: ammonia. This was shown when Yonggary was having a reaction during an attack on the oil refineries. This causes him to start itching about.

Using a more, refined concentrate of ammonia was enough to kill him. Albeit, this was only exploited in the Showa film.

Trivia

 * In Reptilian, Yonggary's height is estimated at "fifty times the size of a T-Rex". As the largest T. rex specimen currently known is 4 metres tall at the hip, this would place Yonggary as being at 200 metres tall.