Invulnerable Cage

[Mooncake]

I noticed this while doing bard daily. Attacking it seemed to have no effect.

Attacking it:

http://i.imgur.com/7ABbDNV.jpg

1 minute after:

http://i.imgur.com/JNq9zoq.jpg

[X29798]

I got it too, doesn't seem to change anything though

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