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human
[Shadow of War] How the hell is celebrimbor so powerful?

I mean, he's just a fallen elf who made a ring, right? What gives him the power to basically single handedly stand against the full might of Sauron and all his armies?
gpt
Celebrimbor assisted with forging the one ring, and briefly stole it from the hand of Sauron.  In Shadow of War he forges another ring to assist in challenging the Dark Lord.

The ring amplifies the power of the wearer.  When a hobbit wore it, it made him invisible.  If a being mightier in stature had worn it (Gandalf, Elrond, Galadriel) it would have made them into a dark lord, capable of challenging Sauron in open combat and wresting control of Middle Earth from him.

In Shadow of Mordor's Bright Lord DLC, we see Celebrimbor attempt this exact plan, which ultimately fails.  In Shadow of War, he tries again and (spoiler) ultimately fails.