I don't know about you guys but for almost any kind of raid boss, if the timer is longer than 1 hour, I use 1 level 1 2-star knight. It does like 200 damage. That way, more people can get in and share the rewards. Maybe I'm wrong, but my impression is that most participants get the same amount of reward, with the discoverer getting a separate bonus. The problem is if everyone does tiny attacks, the boss will never be defeated. But I've always done it this way and always get the reward.