how do i fight the viper?? i beat the final boss but cant find him?

[Delaborga]

i saw there is a viper dragon boss but after beating the second boss i can only go to the title screen

[Golem]

That boss was only available during the beta test! Current demo only has two bosses!

[sgrey]

Viper was available during the beta test and you cannot progress to that point in the demo. You gotta wait until the game release.