Slave of Bolas by Steve Argyle

On the plane of Alara, split into many shards that have now converged, there was a place called Bant. Bant was a land the valued order, knowledge, and the appreciation of that natural. When the other shards of Alara converged into Bant, it was invaded by enemies. Here, we see an angel, possibly a Battlegrace Angel with her mind and sigils being tainted.

On Bant, sigils are awarded for great deeds and even carry power in and of themselves.

But here we see the sigils being tainted.

Who could do such a thing?