Son of Arnor
Core Set#15 (x2)
Ally
[3] 0 2 0 2

Response: After Son of Arnor enters play, choose an enemy card in the staging area or currently engaged with another player. Engage that enemy.

...and the North-realm they made in Arnor, and the South-realm in Gondor above the mouths of Anduin.
–The Fellowship of the Ring