Il Principe (of Beleriand...)

[Tuor of Gondolin]

Well, aside from the fact that Nilpaurion now knows without a doubt that he is doomed

Actually, not necessarily so. He needs to "stay alive" until
the valar are finally convinced to come back and make
Morgoth an offer he can't refuse.

So he gets his peoples (smaller in # then Nargothrond or
Gondolin, partly for security) and does recons. An interesting,
if undeveloped, cave complex is found on the north side of the White
Mountains, conveniently behind some rivers and with a
spooky woods and strong dwarf underground dwelling to distract
any far-ranging Thangorodrim scouts. His tunnellers then enlarge
some exits they've found that lead into the heart of the White
Mountains and prepare a small, unobtrusive port facility along
the south coast where there's an interesting promontory
(could make a good castle some day).

P.S. He knows about the valar intervention by reading some
history books uncovered in Oxford by a 20th century professsor.