Rek'sai's adamantium tunnel

Severity: Moderate

This one I discovered by accident, but this can be seriously abused. During a game against Rek'Sai, I stunned her with a full Braum passive as she was tunneling, and when she came out the other end, the tunnel was frozen in place and couldn't be destroyed. I don't know if she could still tunnel through it as normal, but the cooldown meter was frozen at zero, so I'm assuming not. She COULD, however, ult to it, as I discovered the hard way when I was escaping later in the game.