AE did something similar to this in AQW. They'd release content leading up to the main bosses. Each one had a quest line that required grinding and sometimes puzzle solving. It was a great game. 2D RPG with seemingly endless content. Free to play too. Here's what they did... I go a bit in-depth with the storytelling, but it's the gist of what happens and shows how long things take... There were 13 Lords of Chaos led by Drakath. After defeating the 12 (which happened over a [i]decade[/i] of updates) you have to challenge the final one who is... You. You eventually actually die in battle. However, you're a god (technically) and you take Death's life (kinda) to resurrect yourself. Then you go on and battle Drakath. You disarm him in combat after all the build up. You then return to your own realm, only to find out it's been destroyed. Honestly, it's the best canon story I've ever seen in a game. Lasted a long time and was filled with plot twists. That game, is how Destiny should've been. A long build up to the boss with a fight that you don't win by a landslide.