Something you did has caused a past self to not return to the time pod. This means that you could not possibly travel to the future, which means you could not have prevented your past self from returning to the time pod, which means that you could possibly travel to the future, which means you could prevent your past self from returning to the time pod. INTERESTING.
Ironically, On epic mode, the cosmic monolith can easily be defeated! just wear these clothes at max: PRIEST HAT/BODY, CRYSTAL STAFF. NAZI HAT/NINJA BODY. GAS MASK/NAZI BODY. and the sand monolith guarding the last two crystal pedestals kills you in one hit!! WTF
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