You did a great job making this animation. It is pretty dark and creepy, and the undead/shadow/plant hybrid is both demonic and Lovecraftian to me, adding a very disturbing threat overall to other characters. The ground absorbing the dead and turning them into demonic/Lovecraftian horrors plus the fact that at least two inhabitants are undead makes me think that the setting might be in Hell or some other location that is dark and supernatural. That would definitely explain a few things.