I'm a new D&D 5e player and I'm making a character using both the players handbook and the new Mordenkainen’s Tome of Foes book. I was wanting to create a Githyanki Fighter.

I noticed that the fighter class give proficiency to all simple and martial weapons and all armor, while the githyanki race feature "Martial Prodigy" has proficient with light and medium armor and with shortswords, longswords, and greatswords.

Do I double the proficiency of these weapons and armors or what exactly would happen in this case? Do they stack somehow or are they redundant?

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  • \$\begingroup\$ so if I am understanding this correctly nothing happens because my fighter proficiency and the Githyanki's Martial Prodigy trait are one in the same? \$\endgroup\$ – Grimmsasuke Jun 2 '18 at 8:44

They are redundant

A proficiency from two different sources do not stack (Player's handbook pg 12 notes that the proficiency bonus can't be added to a single die roll more than once).

So in this case, the proficiencies granted by Martial Prodigy are redundant since you already gain proficiency in those weapons and armor types due to your fighter class.

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