If you have a juvinile or a adalesent you can pick it up with a maewing and glide looking for metel harvest it and put it in the mag for weight reduchion then glide back to base ( baby mags can be picked up by maewing too but they dont have enough slots to be able to carry much juviniles and adalesents have many more storage slots hope this helps!
Magmasaur is able to destroy ALL STRUCTURES utilizing its searing spit. While it is a walking forge it produces metal at the same rate as a refining forge. You can use the jump button to taunt other creatures and when holding searing spit use crouch to erupt. (This attack pushes creatures back and leaves magma everywhere) it is breedable in lava. Hope this helped