Slaying Dragons

1.Head inside the dragon cave in Nostalgia. After the map with the road blocks, enter the map with the ashbiters. Before going down the stairs, turn right to find the Iron Felix NPC at 54, 68.

If you're using the video below as reference, at timestamp 3:38, turn right instead of going down the stairs.

2.He asks you to kill 50 dragons, big or small.

3.Head inside the dragon den and kill 50 big or small dragons.

4.Once you're done with your kills, head back to Iron Felix for your reward. Make sure to talk to him again to unlock the next quest in the quest line, Dragon Slayer.