The Druid of the Last Days

The purest fantasy epic, there is no rebirth and time travel system, etc. I don't like to take detours. The story takes place after the necromancer led the evil dragon to destroy the continent of Ates. The sea flooded the land, and the only seven remaining cities were on seven islands imprisoned by magic. The only hope to save this precarious world lies in the last druid. His name is Nolan, and he was originally just a puppet city lord who was bullied...