I found a blue Portent

I was farming for Skyshards today ,when I saw footprints on the ground. I followed them for a couple of minutes and I found the rare beast. It was a blue version of Portent. I already have the red version of him ,that's why I didn't tame this one.
I don't use quilen for a pet and I've tamed Portent just for my collection. Here is a pictures of him:

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