This is how to get rock drake eggs on fjordur you need an andrewswarchus and the saddle for it (it protects you from radiation) level him up in melee damage and stamina go right next to the egg cove get out grab the egg book it wait a while (15mins) go back in and repeat process and you got your self an army of rock drakes! The cave is located in Asgard purple forest around the outskirts of the map CAREFUL there are shadowmane around the forest the cave is in one of the corners good luck. JVspitfire