http://www.heroesofnewerth.com/heroview.php?hid=115 says for Glyph of silence:
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Activation
Any enemy hero the Vindicator can see and who casts a spell while in range of the Aura is Silenced.

Any enemy hero who dies while in range of the Aura will permanently lose 1 Intelligence while Vindicator permanently gains 2 Intelligence.

Only applies to visible enemy heroes.
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which is inaccurate after the changes.