Current questions and answers regarding the map editor.

Okay.
I understand.
I know about this, I'm familiar with it, but it's still not exactly what I need.
I saw a group on the social network "VKontakte" where the group administrators create creatures for the game on request.
I saw a mix of an Angel and an Undead.
It's all about free rein to your imagination... (Spider Goddess)
I ALSO WANT TO LEARN THIS TECHNIQUE.
What do I need to do?