A thought: Helk has always been, and still is, acting according the Will of the World, even if he doesn't know. When he was contacted, he was told that this world full of suffering needed to change, and that's exactly what he did.
To my understanding (headcanon?) the Will of the World is an agent of change, neither "good" nor "evil", just "change"; a sort of evolutionary pressure, if you want. It doesn't care about by whom and how this change is brought, it only abhors stagnation and the maintenance of the status quo. As such, the 1500 years old plan of Mikaros HAD to come to a conclusion: it didn't mattered whether with a success or a failure, it just needed to give space to a new change. Since he was talking his sweet time, the WoW started increasing the number of Contacted, either to aid or thwart him, however the King's interference prevented the new change to come into fruition, until a new agent strong enough (Helck) appeared on the scene.
Heroes, Awakened, Contacted, they are all the same: people on the brink of desperation (the ones more incentivised to change the world around them) that were given exceptional power to change their situation. Once they got the power, it was no longer a matter of wanting, their own existence would have brou change to those around them.