If you get too close to a wild one that used it's special ability (a charge that will set it on fire and aggravate nearby dinos) it'll display a message saying "getting hot! Stay away!!!!" and that will set you on fire. Don't approach unless you know you're prepared.
Use tranq arrows. It may sound dumb, but their torpor is way lower than their health. I got an egg by just knocking out three of them and teleporting away. WARNING: their torpor drains VERY fast, so you need to keep tranquilizing them while their asleep, or kill them while their knocked out.
The magmasaur has a very very bad turning radius when trying to kill one try to continuously try to be behind it. It’s flaming aura when using its spit will hurt you, the magmasaurs body will become in fire whilst doing this attack that will be your warning. Magmasaurs also come in packs of 1-3 so if you hit one another one will most likely be there
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.
Super easy to kill these. Just stay behind them at their tails and attack. They only are able to defend their fronts. They only have one AOE attack that can hit all creatures in the area with projectiles, one purple cloud that acts as rare flower, and one that heats the area around to ignite ground foes. But they use those sparingly, and are easy to kill with Allosaurs and Rexes.
If you are on a “free build, missions disabled, fliers enabled official servers” you can kill them with Argies. Just attack their backs and tails. But watch for their buddies that might snipe you out of the air from a ways away.
Stay still because they are the first creacher to have the sense of when you are not moving thay can’t see you and if you hit them thet deal damige back to you so if you one hit them they will deal a persentage of damage to you and your mount
This dinosaur will one shot you off the back of your mount! Be very cautious and aware! The AI in these things is actually moronic, slow and almost broken. Once you get in their face and eliminate their magma balls they crumble into ash! ;-) When your close they will still fire the cluster occasionally so be careful, you will notice the magma ‘Heat’ up just before doing this so back off if you can.