The Eldritch Invocation Shroud of Shadow has only one prerequisite: That the character taking it must be at least 15th level (Source XGtE). Currently when multiclassing, the option to take this invocation is not available unless the character has 15 levels of Warlock.
From the description at the top of the Eldritch Invocations section:
If an eldritch invocation has a prerequisite, you must meet it to learn the invocation. You can learn the invocation at the same time that you meet its prerequisite. A level prerequisite refers to your level in this class.
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The Eldritch Invocation Shroud of Shadow has only one prerequisite: That the character taking it must be at least 15th level (Source XGtE). Currently when multiclassing, the option to take this invocation is not available unless the character has 15 levels of Warlock.
From the description at the top of the Eldritch Invocations section:
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Ah, yes. I did not notice that. Apologies.