Not really much on him. I don't have the magazine in front of me but what I recall is as follows.
His origins are from the time of the Imaskari Empire. He was used life extending magics to remain alive to the present time. He was the apprentice of (don't recall name) who teleport himself and his apprentice to the location of the Violet Spire (article doesn't say but I have inferred that the Violet Spire must already existed, else why teleport to that location). The master returned to the Imaskari Empire and didn't return (presumed dead in the final fighting before the empire falls). Yaravindar decides to track down his master and finds the empire destroyed and no trace of his master. He collects what items and artifacts that he can and returns to the Violet Spire. He is reclusive but will trade with the Tuigan for any Imaskari relics and items bought to him.
Violet Spire is described as a typical Imaskari mage abode - namely no windows or doors so entrance is by portals. Interior is also typical Imaskari by being extradimensional (ie. the interior areas is larger than the exterior dimensions suggest. The location of the Violet Spire is on the east shore of the Great Ice Sea in the Endless Wastes.
That is about it. Not much. For what it is worth.