The Plain of Demise was an area that Seola had designed with the intention of many strong people to die here. This place was filled with extremely strong monsters whose levels ranged from 300 to 680. And each and every of of the monsters were stronger than what their levels represented.
So even a demigod rank powerhouse would not be safe after entering this place. And Seola had programmed this area in such a way that a powerhouse would only face monsters slightly stronger than themselves after entering this place.
In that case, the chances of a powerhouse dying here would never astronomically high. Which was definitely not something that a reliable goddess like Seola would want. So she had also created a system that allowed people to be resurrected after dying here.