Ovelon

In-between worlds is a place that is nowhere and at the same time everywhere. No road leads here—yet all paths converge here. Many end up here, but only one out of ten survives. One breath can prove fatal; one exhale can bring relief. But no one can guarantee you a happy life. Because for local people compassion and mercy are not a virtue. The only city is Ovelon: a high-tech society divided into guilds.

Kain turns out to be one of the few who managed to survive and gain immunity to the local radiation.

And now life must be paid back