Avir the Alchmage is a Magic affinity rare from the Dwarves faction. Avir was added during the fusion for Vergumkaar as one of the rares to complete this legendary fusion. Avir has a really good kit for a rare, offering a poison on his A1, decrease atk and speed on an AOE on his A2, and healing and turn meter fill for your team on his A3.
Dwarves lack strong healers and Avir is a great addition for this faction.
Avir does need accuracy in his build to be effective and benefits from a strong speed and defensive stats. He will not hit particularly hard therefore Warmaster is a good tier 6 mastery for him.