Once you are about to give birth make sure you have a reaper pheromone gland consumed (you get them from killing reaper queens only) give birth in a room with no tames or people but you otherwise the baby will try to kill anything in the room and while its irritated it will eat more. Bring lots of glands each one lasts 300 seconds and only you can feed your baby until it is juv
It is the second strongest Reaper ingame. Only thing being better is the Alpha Surface Reaper. Getting impregnated by a queen lvl 150 and getting all 75 lvls possible for it gives you anreaper baby born with 15-20k HP which after imprint almost 30k. Dmg gets over 300% and after imprint close to 400%. Lvled can be 40k HP and over 600% if not 700% easily. Its a beast, can charge jump like a crab, take it down there to the drake nests and you can farm eggs for days. But be aware that light makes him weaker aka he takes more dmg and deals less.