A huge lizardfolk/dragonkin, one of the largest of his kind.  His intimidating size and crisscrossing scars defy his friendly demeanor.  Magical beings may feel slightly uncomfortable around him, as mages may notice small disturbances in the weave that accompany him.
Unlike most of his kind, he much more closely resembles a lizard or crocodile, his long snout is lined with sharp crisscrossing teeth, the largest of which being the upper and lower huge incisors that adorn the front of his jaw.  Oddly enough, Gau wears a massive crown of horns, curling back along themselves several times, as lizardfolk horns only grow a few millimeters a year, he must be ancient.
His tongue is long and ribbonlike, he obviously uses this similarly to a snake as it randomly flicks from his mouth and tastes the air whenever he is awake.
The left side of his face bears his deepest and seemingly freshest scar, beginning at the base of his horns and crossing his damaged left eye socket, it continues down past his mouth midway down his snout to where a small pieshaped wedge is missing from his lower jaw.

(A bunch of lore)
Someone reasonably well versed in planar history may be able to identify Gau as being one, or at least carrying equipment from the Sis'ralar race of the stormnexus, a small planar land similiar to sigil or other planar nexus's, it has long been embroiled in constant war between its factions.  Though it has stabilized in the last hundred years or so, largely due to the Sis'ralar and Daemon factions throughly annihilating eachother.  The Sisralar being a tall, lithe race of lizardfolk whom while being highly intelligent, largely avoided conflict and used cameleon-like color changing scales to hide, small pockets of them may sometimes be found among lizardfolk tribes throughout the planes, usually as a governing body or as scouts, letting the less civilized lizardfolk to much of the heavy lifting of the community.

Further investigation may reveal Gau is a Weave-Eater, engineered for hundreds of years the Sis-Ralar, Weave-Eaters defy the usual laws of magic, though there are plenty of beings that use magic to sustain themselves, or maniplate the weave to their own ends.  Weave-Eaters were specifically engineered to perminantly kill Daemons rather than banish them where they may return, absorbing the body and soul of Daemons proved to be corrupting, so the effort was made to simply have them destroyed instead, the gruesome act of being consumed alive by a Weave-Eater being bad enough, their victims can never be raised, they are simply gone.
Not without consequences, even positive magic has difficulty "sticking" to them, logcally healing or other magic with positive effects has never needed to aggressively attack the recipient, someone attempting to cast magic onto Gau may notice that it simply seems to slide off of him like water.


In reality, Gau is actually HissTok Slaanrii, Godkiller, Lord Commander of the broken Sis'ralar empire.  It was he that largely organized and commited the Sis'Ralar race to near extinction in a gambit to mutually destroy the Daemons they warred with for centuries.


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Falling from the sky now, the burning sun
Blinding the eyes of the evil ones

We're watching, we're waiting, our souls are forsaken
A sign from the warriors, towards evil we ride.
Through the fire and the flames, breaking the chains!
Into the night we go! Torment and pain, trample the slain!
We'll all meet our deaths, We know!

Flash of steel with the setting sun, The endtimes have begun!
Loved ones pile all around us, but still we must carry on.
No mercy we will show to them, No white flag shall be raised
Ride onwards, towards this evil place

Trample their forces we now overrun
Sign of the power inside of us
Our Cities in ruins and lives are destroyed
We at the edge of the universe

Conquer our lands and fell our heroes!
Sanity torn we ride on fearless!
Our victory be heard a thousand miles away!

Still cursing, still crawling, we're endlessly falling
The downfall of our kind, The fate of us all!
Hold your hands to the sky, we bleed and we die
Screaming until we know, Dying in pain again and again
Onwards to hell below!
Stand strong, we fight together, raging through the barren lands
Our eyes can see the dark one, far across the burning sands.
Our Steel will shine forever.!

Rise of the slain, breaking their chains,
Fight through the whirlwind of doom!
Live til the day, conquer your pain,
Under the light of the moon!

Blood spills all around us, and our goal draw nearer
Sacrifice your life to have them carry you away
Take us to the place of death, carry on forever more
Burning on the dreams of memories long gone!

Blinded by the force of evil, cries into the night
Never again will they seen the darkness, they are all gone
Out from the shadows, storming on the wings of revelation
"Your soul will feel no mercy come the dawn!"

Cry thunder! GreatSword in each hand,
Titans of justice, Fearless they stand
Cry thunder! One final command,
Warriors defending, One final stand

Fight on in foreign fields of destruction
Stand as one, no man left behind
Our final victory tonight awaits us
All slain in darkness alone

Through centuries our forsaken lands
Silent we stand here alone
Nothing to say when the evil finally burns

We all stand in silence for the wasted and gone
One warrior standing through a thousand year storm
Our past lives still shining, the starlight reveals
Our glory remembered for the power of the steel