I want to say thank you to the dev team for making the Fireplume Regalia look great on Mechagnomes! It’s great to see good transmog options for them!
There’s a shiny celestial set too. Using the belt, shoulders and cape from that along with the fireplume legs and chest looks really cool on them. Sometimes I use them but mostly I stick to my Sauron mechagnome look with the staff that looks like the eye of Sauron. 
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Mini Sauron for the win