The Wounded Sky by Diane Duane (1983)
I love this utterly bizarre and super-metaphysical Star Trek novel in which the Enterprise uses an experimental engine built by a singing glass spider to travel to another universe where there’s no entropy, the crew’s thoughts all start to run together, and a proto-god threatens both universes. Written way back in 1983, it feels unique and blissfully free of any franchise “baggage.”
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