A perfectly rectangular obsidian portal, emanating a violet light from within, in the middle of a fantasy forest as if it were part of a dark fantasy film from the 1970s.

CyberRealistic_Negative, (deformed iris, deformed pupils, semi-realistic, cgi, 3d, render, sketch, cartoon, drawing, anime, mutated hands and fingers:1.4), (deformed, distorted, disfigured:1.3), poorly drawn, bad anatomy, wrong anatomy, extra limb, missing limb, floating limbs, disconnected limbs, mutation, mutated, ugly, disgusting, amputation, not round edges