Less of an idea suggestion but more of a "i think the idea is neat"

[SecondRateSage]

Basically, some kind of structure like the dungeon/temple. but its guardian plays an active threat the whole time your there. Like a water wraith type entity from pikmin 2/4. always slowly moving after you as you move through the structure

 

[m3lon]

It would be neat if we could actually swing the broken hero sword. I also think it would be hilarious if it could one-shot bosses or enemies with a 1 in 100,000 chance of insta-killing it.