Sorry, I am just not regular that people here ask about the lore.
Rhonin was once a promising mage of the Kirin
Tor until a disastrous misadventure involving the
reckless use of magic cost the lives of several wizards.
He was cast into probation until the
opportunity for penance arose with a dangerous
mission into Khaz Modan. Along with Falstad, a
dwarven fighter, and Vereesa Windrunner, an elven
ranger, he agreed to undertake this seemingly impossible
task. Through perseverance and a powerful
desire for redemption, he freed the Dragonqueen
Alexstrasza from the clutches of the Horde, depriving
the orcs of their greatest weapons — the red
dragons they had enslaved. Furthermore, he destroyed
the Demon Soul, a magical artifact that
contained the sapped energies of four of the great
dragon Aspects. This act restored Alexstrasza and
her fellow Aspects to full strength, allowing them
to defeat Deathwing, ruining his plans for the
corruption of the world.
After that he had little and secret adventure in time and space… but this is really long and I don't want to write it.