Few questions

[Yin]

1) Where do i get Bat Queen Enforcements?
2) Can i attack other players (that are red to me, i am DOY alliance) inside of the military base, or would guards attack me?
3)Character hitboxes: there are 3 : head, chest and legs. With legs is everything clear - enemy moves slower when you hit there. What is effect of hiting in head or chest as example?

And also, does it only work by players or monsters do have that aim zones too?

4)Is it possible to finish 45 rank BD Epic or is it buged and i should wait for another patch?

[NH Horus]

1) Where do i get Bat Queen Enforcements?

AFAIK you can get them in the so called "crystal cave" in the near of TechHaven.
Hint: You need poison & fire resist. You should team with a good PPU there, too.

[Dribble Joy]

Stay away from the queen and use cover right, and you can solo her with a PE.

[eLcHi]

3)Character hitboxes: there are 3 : head, chest and legs. With legs is everything clear - enemy moves slower when you hit there. What is effect of hiting in head or chest as example?

And also, does it only work by players or monsters do have that aim zones too?

You got the Legs right ...

Chest -> Normal damage

Head -> Increased damage

But once a hitzone is completely damaged the damage starts to spread on the other hitzones ... so hitting the head all the time will not give you the same damage increase after a few shots

And i don`t think Mobs have Hitzones ...