To the Vikings, fire dragons were powerful creatures that were the embodiment of chaos and destruction. The mere sight of a lava dragon portended the arrival of violent and tumultuous times.
when their villages were burned down by fire dragons they panicked
To stop the chaos, fire dragons must be destroyed as soon as possible. Citizens of viking empire went crazy to raise money to invite the best dragon hunters to fight lava dragons.

Dragon Hunters are not merely dragon killers. Dragon slayers were the best swordsmen, sometimes dragon hunters were magic masters.

Although dragon slayers were seen as a hero of dragon war, some dragon killers fight lava dragons for golden coin bags.
Whether they were dragon slayers or dragon killers for money to fight lava dragons they have to go to dragon land which was known as lava land. Dragon land was a dragon city where poison spiders and golems as soldiers protected the dragon king. Lava land was also a dangerous land with magma lakes continuous eruption.

It’s not easy to be a hero of dragon war, many dragon killers couldn’t come back to get their rewards. They laid down forever in dragon city. Some people came back from dragon land with missing limbs. Some of them an eye dropped in dragon city.

Lava land is still erupting and dragon hunters still come to dragon city to fight the dragon king for reputation as a hero of dragon war.