Usually.
For the next week, mimics — creatures that look like treasure chests but are in fact incredibly hungry monsters — have invaded the game and insinuated themselves into dungeons to surprise the unwary adventurer. Once defeated, mimics pay out the normal loot along with a special token that can be redeemed for rewards.
Don’t like the whole mimic hunt event? Players can get sprayed with repellent (seriously) that will disable mimics on sight and opt them out of the fun. The event is running for a short time, only through March 21st.
Source: DDO. Thanks DDOCentral!