1.) In ROTB, I think there is a wankable statement. Primal says that the space bridge key contains more energy than a supernova and that any tampering would ignite it. Optimus Prime later tampers with it and it indeed gets ignited. I think a lot of people disagree with this but I still think it's a wankable statement.
2.) OP in this film has enough to strength to resist getting sucked by that portal that's strong enough to destroy and suck that metal tower thingy in the middle of the volcano.
Also, it seems the initial emergence of this tower causes the volcano to erupt (video down below). I have seen people suggest that erupting a volcano would take impressive amounts of power. Not sure how impressive this one is exactly. This one seems like an active volcano. IDK sure how much that would affect things.
Before anyone says the tower came out of thin air, if you look closely, it still does come out of the volcanic rock, as it pushes the volcanic ground up. We can say that its emergence caused the lava to rise to the volcano's surface.
I could be completely wrong about this BTW. That lava thing may not be that impressive for all I know. But if it is impressive to seemingly make the lava come up to the surface, then the tower took such an energy when it was emerging.
3.) The drones in the final fight were impacting the ground from space at super fast speeds and were noselling it. The Freezer drones impacted the ground in pods, but those pods get obliterated when they hit the ground, so I don't think they give the drones any protection.
The pods go through this portal and you can see how far away it is from Earth:
2:32
I am aware the drones earlier in the movie had trouble with humans but these ones are closer to normal sized Transformers.
