I am a Great Druid Who's 400 Years Old (Book #1): A Portal Progression Fantasy Series

The next books in the series:
I am a Great Druid Who's 400 Years Old (Book #2)
I am a Great Druid Who's 400 Years Old (Book #3)

The Gods came up with a game: one created Demons, the other created Heroes.

The conditions were simple: if the Heroes could beat the Demons, then their lives in the real world would be saved; if not, then their mortal wounds would kill them.

But what's to be done when the Heroes start fighting amongst themselves, and the Ruler of the Demons turns out to be far too powerful?

Well, one can always improvise...

As the last survivor, our Hero conquers evil and returns to his world - to modern Russia… with 400 years of lived experience still stored in his memory!