When u find a reaper if u want a easy way to get pregnant make a trap with foundations and pillars after you get it under 2k hp it will glow pink if you use a drake or megalosaurus then hop off out of biting distance of the reaper qait about 2-3 seconds until its looking at you and hop back on your tame and it will grab you and impregnate you since there are foundations the reaper will not bury itself this can be used to get multiple for your tribe or anyone after impregnation is done take a gun preferably a shotgun turn your light on and kill it with a gun or crossbow or whatever your using this will give your character the levels for the reaper caps at 75 btw you have to kill it with your character if you use a tame you will not get very much exp.
Since i cant find this anywhere. Reapers take reduced damage naturally so its a good soaker. Dont bring light pets near theese because they take more damage and deal less damage.The reaper burns when light is near it. Nameless will attack it tho. Sorry for bad english.