Not sure if this one has been reported yet or not, in Firestorm Citadel you can glitch through gates using a statue, this allows knights to do both sides of the split path in the Ashen Armory. I have tested this with statues in other levels such as the Royal Jelly Palace and it does not seam to affect them.
Steps:
1. Pickup a statue.
2. Walk towards gate facing it.
3. While still walking drop the statue, you will then be warped to the other side.
I guess we are not supposed to post stuff like that here...
It would be more appropriate to send that report directly to OOO at support@spiralknights.com and not post details here to prevent further abuse of this exploit by those who didnt know about it, intill OOO will fix it.