Hello!
A tamed monster will attack enemies when it sees them close.
Try to play further, perhaps in the current mission sapphire does not appear yet.
Thanks, it sorted all out on its own, the monster was actually moving around the map on its own, attacking other monsters. The sapphire eventually appeared too :)
Another question, is there any way to increase backpack size?
Also, after clicking on premium button, there's a note saying something about a complete walk through, where can one find it? Oh, and I would've pay for the premium anyway, the game is fun to play, but was curious about that walkthrough