When starting a new game, use the console commands and spawn in 1x ghost leviathans, 1x Reaper and 1 Sea Dragon in the starting area, then try to survive and complete the game normally. Then if that's possible bump it up to 2x Ghosts, reapers and sea dragons.
It's absolutely hilarious if you spawn more than 10 each and bait them to the escape pod and then hide in it, the walls of the pod aren't actually solid enough as they'll start smashing it and it'll eventually fly up into the sky and you'll be sent flying either very close or some distance away. You cannot survive the playthrough but it's fun. But yeah first paragraph above this one, give it a try if you haven't already.