Basically I will teach you how to tame a reaper on day 1. Note that it only works in Genesis 2. Spawn near the Rockwell Cave and farm a good amount of wood, straw, fiber and about 80 leather (enough for two beds). Leave at the entrance to the Rockwell Cave a fully enclosed straw structure (I recommend a maximum of 4x foundations) with a door to exit and enter and a bed if your gestation rate is fast or if you are on a server and can't build in caves. Then enter the cave and advance to the fourth room (there is a terminal with a pulsating heart on top). Go to the bridge that connects to the terminal (safe zone, as long as you don't enter the bridge tunnel) and build a foundation with two boxes for your items and a bed. Look for a reaper queen of any level in this room and lure her to the acid lake that is below the terminal. Be careful because the front of the lake is full of worms that disable the tek suit. Go behind the terminal and trap the reaper in the hole of the lake. This lake rises and falls over time, but when it rises it melts the reaper's life. Dodge her ranged attacks and leave her there until she has 2000 life (she will start to release a pink light from her belly). Then lure her through the side opening of the lake and let her impregnate you. Fly away, grab your items. If you manage to leave the cave without dying (optional, the baby is still alive even if you die ), kill all the herbivores (or a diplodocus) that you see in front of you to level up your reaper. When you are close to giving birth, go into the cubicle and lock yourself in, when giving birth, when you are going to adopt, note that the baby will kill everything around him, this includes you. It's safer to let him kill you and come back to get the items from him (he will already be passive). Remember to deactivate the free movement before releasing him around.