Elric, a talented magician from a young age was selected to keep this island safe from the Taint. We have erected a tower in which Elric is using an endless supply of mana to keep the island protected with a huge barrier. For now the island is safe, but his mind and body shall slowly deteriorate. We still aren't sure about how the overwhelming amounts of mana shall affect his mind over time, it could drive him to insanity or claim his life.
The School of Magic is working on finding ways to eradicate the Taint and save the remains of mankind before it's too late. Should Elric leave the tower or develop a mental instability, the Taint would slowly infect the island bringing rise to monsters and affecting the human psyche.