I Recommend traping the reaper in a stone foundation with floors and doors to be able to shoot it also you need to bring a bulbdog or any Dino that emits light and can be turned off then get the reaper below 2000,or 1000 then get out of its reach and then it should grab you and impregnating you then set a box for the baby king reaper then let it burst out of your stomch then imprint it and have fun destroying anything in your path