The Enterprise NX-01 is an Epic Grade 4 Explorer, originally named the SS Yorktown before its retrofit and launch as a deep-space explorer. Under Jonathan Archer, it was redirected into the Delphic Expanse to intercept the Xindi and their planet-killing weapon -- a mission that also helped establish the United Federation of Planets. To build it you need a Shipyard at level 40, with 1-2 blueprints available daily from the Exborg Store or a full unlock through the Offers tab.
The NX-01 guarantees Ex-Borg credit drops across all rarities, giving strong access to the Ex-Borg faction store's Favors and Bundles, and it's the exclusive source of shards for the officer Picard Hugh. Its two passives target Xindi-Aquatic hostiles specifically: Learning The Hard Way boosts base damage against them, and Polarized Hull deflects 9 of their usual 10-shot weapon fire, leaving just one shot to land. Its active ability, Long Road Ahead, temporarily reveals deep space systems without needing a ship physically present -- handy for scouting enemy targets, watching OPC miners, previewing token systems, or gaining an edge in Territory Capture.
The NX-01 upgrades on Ceramic Composite, obtained by destroying Xindi-Aquatic hostiles and refining their loot in the NX-01 refinery. Unlocking its Picard Refit adds an extra Delphic Expanse travel token to the daily refinery claim, and higher tiers scale up refinery rewards -- check the info button on the NX-01 refinery bundles in-game for the exact scaling.