I can't believe my incredible good luck!
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I got Granite Golem on my second attempt using CU & Rock Rhino. I was expecting another 1 hour timer and it took a bit for me to realize I had a 48 hour timer. It gave me a nice opportunity to hatch a couple of eggs in storage (I chose Walrust & Magma Mouse). Now I need to resist the urge to speed it off the nest.