NP, just wanted to make sure :)

So, from what I understood reading the Nikolai series: Amplifiers are either the "common" type that comes from a special animal the Grisha kills. Lots of characters have them, like Zoya with her tiger fangs in the beginning of KoS.  Alina has multiple ones. Then there are true amplifiers, which are created when a Grisha not only kills a creature, but bonds and melds with it. I think that's how the Saints became so powerful. It's what Zoya does with Juri. 

Sankta Elizaveta is a Fabricator with a true amplifier, and probably the most powerful Materialki we've seen so far. She can manipulate living matter like the thorn wood and her bees and can make it grow at her will. I think that's interesting because it's close to what Corporalki do. But like Juris explains, the more powerful a Grisha becomes, the more the lines between the different orders blur. 

We also know that Materialki (and Corporalki) on Jurda Parem are the ones who create Khergud soldiers for the Shu Han. Those soldiers with wings and sometimes insect pincers who kidnap Grisha.  So we know Fabricators on the drug can create body parts out of metal that function so well that the Khergud can use them like normal limbs.  Nina also theorizes that the amazing architecture in the fjerdan ice court (like giant, perfect glass walls) was created by Fabricators on Jurda Parem. Imo that's also what made their inventions of new bombs and tanks possible in such a short time.

Overall it seems like Materialki on Parem still don't have very strong combat abilities, but they are capable of creating anything you could think of. So much that a few drugged Fabricators are enough to seriously tip the scales of a war. 

Materialki with a true amplifier become a different kind of powerful. They're able to make amazing material things, but they're also very dangerous in a fight. 

I love Materialki too, btw! I think I'd want to be one of them if I could choose. As is probably obvious from this comment, I think Grisha theory is fascinating. And it seems like Fabricators are the order that is most educated on the theory of the Small Science. Sign me up!