Okysus

Okysus is a deity belonging to the collection of faiths which correlate with the Children of A New. Though he is not one of the Children, he belongs to the same belief system. Okysus was behind the Incursion and the Shapeshifter plague which threatened the world ten years prior to the plot.

Abilities
Aside from being able to shapeshift into any animal he wishes, a power not belonging to his successor, Jonathan Wolfshine and his Champion, Okysus also possessed three legendary shapeshifts: Hellkite Dragon, Sphinx of Moorwood, and the Phoenix of the Netherworld. He also has the power to bring shapeshifters back from the dead, and to share his powers, which he did during the Incursion when he brought Jonathan Wolfshine back and gave him his Sphinx shapeshift. Okysus is also an immortal being with the largest reserve of Estus in the Known World, making his magical abilities nearly endless.