Source: Heart of the Jungle, pg(s). 37
When forces from the nearby city of Kalabuto attacked Mzali, the mummy of Walkena came to life and destroyed the invaders in a rain of fire. Since then, Walkena has taken over rule of the city, and is attempting to establish an empire that will span the entire Mwangi Expanse. He preaches that the Mwangi are all brothers, and all non-Mwangi should be driven from the region. Those Mwangi who consort with outsiders are traitors.
He lives in a massive palace at the centre of Mzali known as the Temple of the Deathless Child. Those who support Walkena are rewarded. Those who offend him suffer the Punishment of Seven Angry Sins.