When Haunt lands on an enemy already affected by Haunt, it instantly deals 60 seconds worth of Haunt damage.
Soul Harvest gains the effect of every rune and has its cooldown reduced by 1 seconds every time you cast Haunt or Locust Swarm.
Soul Harvest consumes your damage over time effects on enemies, instantly dealing 150 seconds worth of remaining damage.
Tukam lost many friends in his first Harvest of Souls, a ritual war fought by the umbaru. Yet, he did not weep for the dead. He celebrated their passing, knowing their spirits ran free in the Unformed Land.