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Can be captured early in the game in The Sulfurous Wastes because it can be accessed before beating the Gate of Desolation (mission). However, it is hard to cap without a balanced group and is much more easily done when the group can use the Junundu.
Despite this skill's name, you are still able to activate Shout skills while Vow of Silence is active.
Unless your party uses party-wide enchantments, this is nearly guaranteed to be your outermost enchantment for removal.