question about demon box for our friends in Russia

[tvez]

**POSSIBLE SPOILER ALERTS**

I just got King's Bounty, playing with a warrior, whose strength as you know lies in part in the demon box. The problem is I don't know how far into the game i have to go to activate it.

I found the box (I won't say where, for those who don't want that discovery spoiled), but can't activate it yet. My question for our Russian friends: how do I do this?

The only reason I'm asking is I'm hesitating to start taking on monsters without the box, because I want the demons inside to earn experience from them. But part of me thinks I'm going to have to start clearing out monsters anyway -- i just don't want to clear out too many.

Can someone give me a hint how to activate the box? Do I just need to be a certain level?....