They can be found almost everywhere in the volcano biome however the nests that contain the eggs are located inside the volcano. Easiest entrance inside is next to the "Egg-straction" mission beacon. The nests are located in pools of lava a nest can hold anywhere from 1 to 3 eggs. The lava pools tend to have minimum 1 dozen adult magmasaura that will start hurling fireballs in your direction once you take a single egg. They are quiet slow moving a ferox will be useful in getting in and escaping. The pools of lava aren't an instant kill.

Be careful, this guy has a fiery explosion attack that he’ll kill you with.

Beware of these lil dudes when stealing eggs they can 1 shot you.

Be careful riding your magma to get more eggs. They aren’t resistant to searing spit

These guys are dangerous a stupidly strong they are great if you tame them

Watch out when tour trying to get magmasaur eggs if the magmasaurs hit your dino you will also gwt the fire affect and die this happened a few times when i was getting eggs :(

I did not know they could one shot you with lava rocks. That went poorly

The fire bomb can kill you instantly even on mounts

Just use a thylacoleo the bleed is great

They have caves to go in there is three nests in the fire wyvern area

Egg incubator boosts 20% at 100 degrees

Use a desmodus and do it at night so you can be invisible

Shot them from above

Babies eat ambergris from the rocks in the lunar biome.

Badbilly02 you find them in the volcanic biome on genesis 1, is you spawn south east you’ll be by a giant metal structure then go into your missions and select the mission eggstraction then go to where it is and they’ll be a cave by here and that is the entrance to their egg nests but I recommend going just below the mission point ass there’s another entrance with purple crystals which is an easier option :)

In Arctic biome, I was able to get the egg to incubate with 26 AC'S. Hope this helps

These thing are basically the wyverns of genesis

Is this the first creature to do a warning before attacking?YES

Easy way to get high level Magmasaur eggs Fjordur:

What you need:

Desmodus

Rifle or any form of long distance weapon

Lots of ammo ( around 200-300 just to be safe )

1. At night use the cloak ability on your desmodus to sneak into the magmasaur cave unnoticed.

2. Find the high lvl eggs ( they’re usually the most guarded eggs )

3. Latch onto the roof with the desmodus and equipt your rifle.

4. Shoot and kill any magmasaurs guarding the egg

5. Steal the egg then fly out of there as fast as you can.

Be wary-to get their eggs is hard,

Climbing inside the terror mountain,

That might explode and you'll be charred.

Try to use somethimg fast for their offspring,

A bloodstalker, or two.

But beware for they can give you a flare

Killing all of you.