Henry Sealance was a couatl rider of Kul Tiras. He participated in a surprise attack on the fleet of Janus DeMeza anchored near Zul'Dare. The couatl riders managed to sow confusion aboard the enemy ships, until Xanthus Alverold and Henry Caldwell could arrive with the royalist fleet from Boralus.
Although Henry Sealance was killed before the reinforcements could arrive, Janus DeMeza's fleet was scattered. However, due to the treachery of Henry Caldwell, Janus DeMeza was warned away long before the attack began, and managed to escape. Caldwell also spread disinformation, claiming that Janus was hiding in Seashire.