Worms represent his brain decaying, as if worms were burrowing and eating it. In Waiting for the Worms, i think he means the worms that will eat your brain and turn you into a faceless nazi.

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Follow me "he sounded of dreams supreme" follow me
Drifting within the glow and the after-glow of the eve
And if that firelight, I could match the inner flame
Sacred ships do sail the seventh age.