The thanatosaur is far from the most deadly or dangerous lifeform in the cluster. It is, however, one of the most impressive. A massive, spined reptile/crustacean the size of a large bus, it’s the ultimate prize for every big-game hunter. It can only survive on Hades, in the Eden system, because only there are there enough enormous, dangerous predators for it to eat. Any hunter whose lodge sports a thanatosaur skull will be the envy of his friends.
Like most Hades lifeforms, the thanatosaur can only survive in a state of continual stress and conflict. In parks and reserves, it will literally die of boredom as hormone fluctuations lead to cardiovascular degeneration over time. Thus, anyone who wants to hunt a thanatosaur needs to go to Hades.