After reporting to him of your battles against the Orcs and Wargs that guard the gates of Fornost, Mincham surmised that it was as Halbarad feared: Angmar has sent a large force to reclaim and fortify Fornost.
'Quick now, you must return to Halbarad in Esteldín and tell him what you have learned here: Angmar has taken Fornost once more.
'From such a fortified spot, Angmar could dominate all of the North. But there are even worse things to worry about. Tales tell of a great evil which inhabits the collapsed and ruined halls of Fornost. This evil could be called to serve Angmar!
'Go to Esteldín and tell Halbarad all that you have learned here!'
Halbarad can be found in Esteldín.
Mincham beseeches you take the knowledge of Angmar's presence at Fornost to Halbarad.