The curse of Morgoth in CoH.

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Regarding Morgoth's curse and his ability to govern the mind of Turin and others I found these passages and came to think of this old thread:

From HoME X: Myths Transformed

...'thought transference'... [is a] process of mind reading: this is but the reception, and interpretation by the receiving mind, of the impact of a thought, or thought-pattern, emanating from another mind, which is no more the mind in full or itself than is the distant sight of a man running the man himself. Minds can exibit or reveal themselves to other minds by the action of their own will (though it is doubtful if, even when willing or desiring this, a mind can actually reveal itself wholly to any other mind). It is thus a temptation to minds of greater power to govern or constrain the will of other, and weaker, minds, so as to induce or force them to reveal themselves. But to force such a revelation, or to induce it by lying or deception, even for supposedly 'good' purposes (including the 'good' of the person so persuaded or dominated), is absolutely forbidden. To so this is a crime, and the 'good' in the purposes of those who commit this crime swiftly becomes corrupted...

...and with regard to the enemy, Melkor, in particular, he [Manwe] could not penetrate by distant mind-sight his thought and purposes, since Melkor remained in a fixed and powerful will to withhold his mind, which physically expressed took shape in the darkness and shadows that surrounded him.

This seems to indicate that powerful beings such as Manwe and Melkor/Morgoth have the ability to penetrate and dominate the minds of lesser beings by means of distant mind-sight, although it is a crime to forcefully do so.

This might be what the curse in practice meant: that Morgoth tried to design a horrible fate for Hurin and his kin by means of distant mind-sight and mental domination. This process however would not be perfectly accurate, and the unwillingness and strength of will the objects in question would make it more difficult still. But do not doubt the power of Morgoth Bauglir!