What once existed is now shards of reality, floating in the sea of conflict...
The Truth Mage, Veracit, feared to utilize the Observer's Paradox, uncomfortable with their perilous effect on reality.
It's so cute!
Wait, why is it glowing?
A magical pair of glasses once allowed the sharpest of minds to perceive the physical world around him. His cutting insight, throwing light on the darkest of secrets, is now housed within the spectacles.
A small, primitive village has yet to discover fire, which is a good thing because there are highly flammable (but not otherwise dangerous) gasses in the air. The heroes, blissful in their ignorance, don't know that and think it a wonderful idea to show the locals open flame.