1 - no animation. real people
2 - probably 80s or early 90s
3 - story is set in the 80s or 90s
4 - Somehow, a creature is trapped inside a pillar of a modern day building, there's a scene where the creature awakens and destroys said pillar.
5 - very gory.
6 - the creature could have been named "fenrir" or "ragnarok"