These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Level Breaking Bug: In the Temple of Agamanus (the dungeon you need to clear to get the location of The Halls of Colossus) the room which holds the item you were sent there to get requires you to swim through some trenches (unless you can use Passwall). The room has a bad habit of spawning a ghost or wraith, which levitates over the entrance, blocking you from getting in. The only possible fix (assuming you have no way of using Passwall) is to save under the enemy and reload*