Nock him out with a stick. This can take a great deal of time. Then take a self-made recipe (5 Wyvern milk, 3 potions of forgetting, 2 giga eggs and 10 trex eggs) and give it. He needs this several times, about 100 pieces of the recipe. After that you have to wait a very long time, it consumes very quickly torpor, and takes about 19 hours to around. Then you will notice that it was pointless to read this comment and that you wasted your time

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