Its in the forest, wanted to play the update for a while and when i finally got to it i totally forgot where and what. I went to the forest down where there is a foot print and further further, there was a safe space with crystal where you can either go further or go back to town, and if you go there was a statue and roving patch blocking the way. It even did a confirmation that i want to come closer and attack it.
ooohh that yeah thats the hardest boss in the game.
first of all go and grind a shit ton and finish the beehive chapter
second it isn´t blocking anything you cant go through the path after you defeat it
third when you defeat it drops a legendary item that you can bring to the black lady and craft one of two legendary weapons to Niven or to maeve i think but you can only craft one of these so chose wisley
i hope this can maybe help you a little