My stupid way to get an egg on Fjordur.

This can be early game too you just need an argi with very good stamina and an Anki with great health then grab the Anki with the argi and make your way into the cave (if there is a safe spot stop to get more stamina.

Find were all the magmasaurs are and drop your Anki then get there agro and fly up they will attack the Anki

Once they leave the egg spot use a spyglass to see the levels (go for a 115 or higher) swoop down grab the egg and get the hell out of there